diff --git a/2021/day10/10.py b/2021/day10/10.py
new file mode 100644
index 0000000..27a63e4
--- /dev/null
+++ b/2021/day10/10.py
@@ -0,0 +1,22 @@
+lines = open("input.txt", 'r').read().splitlines()
+
+
+di = {
+    ')': ('(', 3),
+    ']': ('[', 57),
+    '}': ('{', 1197),
+    '>': ('<', 25137)
+}
+score = 0
+
+for l in lines:
+    stack = []
+    for c in l:
+        if c == '(' or c == '[' or c == '{' or c == '<':
+            stack.append(c)
+        if c == ')' or c == ']' or c == '}' or c == '>':
+            if stack.pop() != di.get(c)[0]:
+                score += di.get(c)[1]
+                break
+
+print(score)
\ No newline at end of file
diff --git a/2021/day10/input.txt b/2021/day10/input.txt
new file mode 100644
index 0000000..674cd38
--- /dev/null
+++ b/2021/day10/input.txt
@@ -0,0 +1,110 @@
+{{{[(<<[[[<<([[]()]<()<>>)((()()))>([(()><{}[]>]({()[]}))>{[{(<>[]){{}[]}}<({}()){{}[]}>][<<(){}>(()<>)>{[{
+{<<((({{<<[<<{[]()}(())>([[]()])><[[{}{}]<[]<>>](({}())[{}<>])>][([{[]{}}](<<>{}>{()()})){({[]{}}<<><>>}{({}
+(<[{<{<(<[[<<<[][]>(<>)>><{<(){}>{[]{}}}<{{}[]}{()[]}]>][<([{}<>]<[]<>>)<{[]()}[()<>]>>[{{<><>}<<>{
+([{([{{{<[[{[{{}()}<{}[]>]{{<>()}<()>}}{<<{}()>{<>{}}>}]]<(<<[<><>]<<><>>>{<{}()>({}())}>){(<{()<>}><<<
+{(<{[{[{([<<{<()()>((){})}[[{}{})<()[]>]>>{([<{}<>><<>[]>]<{<>[]}[{}<>]>){<[<><>]{{}{}}><(
+[<([<(<{[<[{<<()[]>{()[]}>}{<[{}][[]{}]){[()()]{<>[]}}}]>{(<(<[]()><{}<>>)(<{}<>><{}()>)><<(<>())>>)
+(<{<[<[(({([(([][])([]())){(()[]){[][]}}][({[][]})[[[]{}]({}[])]])}{{{[{<>()}{()[]}](<{}[]><[]<>>)}<(
+<<(({([[[([{[[()()]{<>[]}]<[<>[]]({}[])>}]((<[[]())(()<>)>(<{}()>([][])))<([<>[]](()[]))>))[<[[<{}<>>([][])]
+(({[{[{<(({([{[]{}}(()())]{{()()}<<>()>})([{{}{}}[{}{}]]<<(){}>[()<>]>)}<{{(()[])}}{{[[]()
+[<{<<<{<[[[[(((){})(()[])){<[]{}>}](<[<>[]][<>()]><[()<>]<<>[]>>)]({{[<><>]}<<<>{}>[{}<>]>}[{{{}{}}([]{})}
+{[<({<{{<([(<<<>{}>{<>[]}>{{()<>}<<>{}>})(<<[]>((){})>)][<[<()<>>[()]]<((){})<<><>>>>[<{()[]}<{}[]>>]])>}{{<
+([[<{([{<<[{<[{}<>]{<>{}}>{[(){}][()()]}}<{(<>[])(<>())}([<><>])>]>{{{<([][]){<>()}>{([]()><()()>}}{{({}()
+(<[[({{<([[[[{{}<>}[<>()]][(<>[])<<>()>]]]([([[]()][()()])]([[{}[]]<{}[]>]{[{}<>]{<><>}}))))>(
+<<{[([(<<({{([{}[]]<<>()>)<<()[]>[{}<>]>}({(<><>)[{}()]})}[{<[(){}]>{{<>[]}[<>{}]}}[<(<><>){{}[]}>{{<>{
+[<({[({[<{[(<[{}()][{}<>]>{{()[]}(<>())})({{{}<>}<[]()>}{<()<>>})]}[<<{{[]}({}{})}([[]<>][()<>])>>[[[
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+<[[{[<({{[{(<([]())<{}[]>>(<<>{}>{<>})){[{[][]}{<>[]}]{[[]{}]<[]>}}}<<(([]{})[<>{}]){[{}()](<>{})}>[[([]{})[{
+([(<[<[[{([[(({}{})[(){}])([<>[]]{()[]})]([[()<>][<><>]])]{[<{[][]}[[][]]>{<[]()><()[]>}]<[(<>())<<>{}>]>})}
+([([{<<{{{({<<<>[]><<><>>>[[<>[]]<[]()>]}<<{[][]}[{}<>]>{[<>()]{()[]}}>)[[[<<><>>{(){}}>[({}[
+[[<[[({{(<[{<{[]{}>>({[]()}{[]<>})}{(([]{})[<>{}])[(<>{})<[][]>]}]>){{<[{<{}<>>}<([][])([]<>)>]((<(){}>(()
+([[{<[<((<{([{[]<>}({}[])]){{[[]]{<><>}}[<[][]>([][])]}}{[(((){})([]())>]{{{[]()}<<>()>}}}>){<[(
+{<(<{{<{[{<{{<(){}>{<><>}}}[{[{}<>][{}<>]}[[[]{}](()[])]]>}][<<<{[{}[]]<()()>}(((){})[()[]])>)((<(()
+{([<{<{([(<{[{{}[]}[(){}]]<{()}<{}()>>}[[[[]{}]{<>[]}}]>{[[[<>]<<>()>]{<()<>>{[]<>}}]})<<{[{<>()}<{}<>>]
+{<<(<[<[[[[{{(()())([]<>)](<<>>({}()))}<[{<>()}[()<>]]>]({[[[]()]<()<>>]}[[<[]<>><()<>>]{<{}()>[
+[<{(<<[<[(<[{(<>{})<{}()>}]<[[()<>]{<>()}]>>)]](({<{<[()()]{[]()}>((<>())(<>{}))}{[<{}()>]<(<>[
+[<({({[[[<{<[[()<>]<<><>>]{([]<>)([][])}>[[(<>[]){(){}}]]}{{<{<>{}}<<>>>(([]{})[[]<>])}[<(()[]){{}{}}>]}>[{
+{(<<{<[{[{({{[<><>]{{}[]}}}(([{}[]]<[]<>>)})[<(<[]{}><<>()>)[<{}<>>[<>[]]]>(<((){})[{}<>]>{(
+[<(({<<([{[{{{<><>}([]<>)}}]}](<(<[([][])<{}[]>]{{{}{}}[{}{}]}>{(<[][]>{{}{}})})>)){[([{{<[][]><()>}
+[({[[[(<<((<(<{}()>([]<>))(<()()}<{}[]>)>(([{}[]](<>{}))[{[]<>}(<>[])])))>>)][<{({<[[<{}{}>{[]()}]{(<>{}){
+{(([((([<[{[(({}[]){()<>})[[{}[]]({}())]]{<[[][]](()<>)>{[{}[]]{[]()}}}}<{(<<><>><()<>>)<({}[])
+{([{{[[{<({([[<><>]<{}<>>]<[()[]]<()[]>>)}[[{[{}{}]{{}{}}}]{[{[]{}}([]{})]{(()())[<>()]})])>}]<
+([<[{{{([{{<[[{}{}]]{<()()>}>{{{()[]}([]())}}}<<{<[][]>{<>{}}}>{[[{}()]([]{})]{([]{})(()())}}>}])<<<((<<{}{}
+[{{[<[[[<({[[<(){}>{{}[])]{{[]<>}([])}]}<({{<>()}[{}{}]}{[()()]{[]<>}})[{[()<>][()[]]}]>)>[<(<{{
+(<{{({{{[({([({}[])<{}{}>](([]{})[{}{}]))})[(<<((){}){()<>}>[[[]<>][{}[]]]>{<([]){{}<>}>([[]{}])}){[(((
+<[<{{(<(<<[{([(){}][()()])((<>())]}]>>)>)}[{(({({[[{(){}}]][{(()()){{}[]}}<(()())(<>())>]}{([{[]<>}<[]<>>]
+{({<[[<<{<{(({<>{}}<<>{}>))[<<{}()><<>()>><<(){}>({}())>]}<(([{}[]][{}{}]){<{}>}){[<[][]>((
+(<[{{[{([<<<(((){})([][]))>([[<>{}])[<{}()>{<>{}}])>>{{{{<[]{}>[()()]}[(<>{}){<>{}}]}{([[]{
+{(<[{({<<(<<<(<>())[{}[]]>>{([()()]({}{})){<[]()>[[]<>]}}>[[<[{}{}]{{}<>}>{[<>()][<><>]}]{<[<>][[]<>]>((<>{
+{[<<(<<({(<<[{<>[]}]{[{}{}]<[]()>}>(((())<<><>>)((<>{})[{}[]]))>[<({<><>}[[]{}])[<()[]>{()()}]>{{({}[])({}()
+<<<(<((([<{[{{{}<>}{{}[]}}[(<>)<<>[]>]]<[([])]<{()()}{<>{}}>>}><{<[[[]<>]<{}<>>]>[(({}[])<[]<>
+{<(([[{{[({(([[]{}]<{}()>)<([]())[[][]}>)<<<<>>{()[]}>[<<>()>]>})<<[({[]<>}[[]<>])<<{}()>({})>]{<<()[]>(()[
+([<([{<[<{<([<()>({}[])](<<>{}>{{}{}}))<<({}{}){{}()}>[([]{})[[]()]]>>{{<[()<>]{()<>}>((<>())[{}<>])}<[(<
+<([{({({<({[[(()[])[[][]]][(()){()[]}]](<{()<>}(()())><[[]()]([][])>)}{[{[<><>][{}{}]}<(<>[]){{}[]}>]
+(({[<<[[{{<[{{[][]}(()[])}{<()<>>}]([<[]<>><{}<>>]{<{}()>[<><>]})><{{<<>{}>[[]{}]}{<{}<>>[[]{})}}<<<{}<>>
+<{{<(({{(<[<<[[][]]{[]()}>><<{()[]}{<>)>(({}{})(()()))>]{(<({})({}{})>([()()]<{}<>>)){([{}[]]([]{}))[<[]
+{({[<<[[<[<(<{<>{}}{{}()]>([{}[]][()[]])){{[()[]]{<><>}}({<>()}[<>()])}><<{[()<>]<[]>}<({}[]
+<{{<<{<{<([(([<>()])<({}())<{}[]>>)[[(()())[()()]]{{()()}<{}()>}]])<[([<{}{}><[][]>])[[<[]<>>{[]<>}
+<{<([[<{[{([[[[][]]<[]<>>][({}()){()()}]]<(([]())[<>[]]){[()<>]}>)[[<<{}<>>([]{})>[(()<>)[[]()]]]]}((((<<>>
+[[{[<<([[({{<<{}<>>{<><>}>[<(){}>([]<>)]}<{<{}[]>{()[]}}((<>{})<()[]>}>}[<([[][]]([][]))({()()}<()
+[{[[{(<({(<({({}<>){{}[]}}{<<>[]>{()[]}})<(({}())[[]{}])>><[<{{}[]}>{<[][]>[()]}]{((<>{})(<>
+{{<{[[[(<({<(<[][]><{}<>>)[(<>{})<<><>>]>})>)]]]}{([[<<{[{<<()[]>({}{})>({{}()})}]<{[{()()}]<[[]]<()>>
+[{{[<((<<(({{[[]()]([]())}{<[]{}>[{}{}]}}<({<>{}}{()[]})<{{}}{{}[]}>>)(<<<{}[])<[]()>>({[]
+([[[<(<([{(({{{}[]}[{}]}[[()()][{}{}]]}({(<>{})({}())}({()()}([]<>)))){{({()<>}(<>[]))[(()())<[][]>
+{([<<{<(<((({({}[])({}[])}([<><>]([]())))<<<[]{}><<><>>>({{}[]}{()[]})>}(<[({}[]){<>[]}](<[][]>{{
+{{(<{<([[<[[(((){})<{}[]>)[[[]<>][<>()]]]{((<>[])(<>())){<<>>([]{})}}]<[([[][]][{}])]>><(({{<>()}}[<[][]>])
+{[[{<<<{{{[[(<(){}>{[]{}})]]}({<[[{}()][{}{}]]{({}[])[{}<>]}>{{{[]<>}[<>[]]}<{[][]}(<>[])>}})}{[<{[([][]){<
+<[<{<[{<({(<<([][])<()[]>><[<>()]{{}()}>)<([()<>]<<>{}>)(({}<>)[()<>])>)})>}][(<<<[[({{}()}{{}[
+<{{(<<{[{<{{{{[]<>}{()()}}{(<>()){()[]}}}[{(<>[])}(({}[])[()[]])]}<<[{<>()}]<{<>()}<{}()>>>{((<
+{[<[{{[[<[{<<[[][]]<{}[]>>><<<()[]>({}[])>>}([[[[][]]]((<>())<<>()>)](<[{}()]<[][]>>({<>[]}{[]()}))>]{{<[{{}
+<([[{[{<<(<{<[{}[]]{(){}}>(<{}<>>{<>()})}{(<(){}>{[]))((()<>)[{}[]])}><(<<(){}><()>>){(<()<>>(()()))<({}())[
+{<(<<{<[<<<[[<[]{}><[]()>]<{{}{}}{{}<>}>]>[[(<<><>>((){}))]({<()()><{}{}>}({<>()}))]>>]([(({<{()()}[
+([{[([({[[<[{(<>[])<<>()>}[[{}[]]<[][]>]]><(<<()<>>({}<>)><(()[])(()())>)({[[]{}]{<>()}}{[[]
+[(({([{[<<[{{((){})({}())}}]{{{<()<>>[[]()]}((<>[])(<>()))}[[[<><>]([]())]({()[]}{()[]})]}>>({[[<<
+<{{(([[[<(<(([[]()]<[]{}>))[<[{}{}](()())>[[()<>](()())]]>{<{<()<>>}(<{}<>>[[]()])>})>[({<
+[<{([{{<<{{(<([]{})[<>{}]>[<()<>><()[]>])({(()<>)<<>[]>)(([]{})([]<>)))}}>[{[({({}())[(){}]}<(
+<([<<[<(<<<<({()[]}<{}<>>)[[()[]][[]()]]><({{}{}}){[[][]]}>>{[((()[])[[][]]>{{()()}{()<>}}]<{<
+<((<{<{<{<<[[<<>()>{<>}]{({}[])<<><>>}]([{()<>}{[][]}]([[]<>](<>())))>[<<[[]<>]<()()>>[{()()}<(){
+<<{[{[{[<{{<<[<>()]<[]<>>>[[()()][{}{}]]>([{{}[]}<()<>>])}[((([]{})[[]<>])<<{}{}>{<>[]}))]}><[{(
+{{{{<<[{<{(({<{}()><[]<>>})[{<[]{}><()()>}{<<>[]>[[][]]}))<{<[<>[]][[]{}]>{[(){}][[]()]}}{{
+<<{([({{[{{<[<[][]>{[]<>}][<[]()>]>{{[{}][()[]]}({{}[]}[()[]])}}{[[<<>{}>](<()()>)][<[[]{}]<{}{}>>
+[{{<{([[<{(({<[]{}><[]()>}<<()<>><<>()>>)<{(<>()}[{}<>]}>){(<{<>{}}({}[])><{()<>}>)}}[({(<[]()>({}<>))<[[]
+{{{({({<{<{[[{[]{}}{[]()}]<{{}()}<{}[]>>]({<[]<>>[[]()]}<[<>[]}<{}<>>>)}{<<(()[])<()[]>>[(<>[])<()[]>]>(<[[](
+<{[(([[[([[<[[{}()]([]<>)][(()[])[<><>]]>(([<>{}]({}()))<{{}}[[][]]>)]({{<{}[]><[]()>}({[]{})[[
+{(<({({(<(<(([<>()][{}<>])<{()<>}<{}()>>)[[[()[]]<[]{}>][[()<>]<[]{}>]]>{<<<[]><[]()>><(<><>)<[]{}>>>})(([
+<{<(([(<<<<<{(()<>)}{<()()>(<>[])}>>>>>){{(<<[[{<>[]}(<><>)]<{[]{}}>]>>)[([{[[<><>]<()()>]{(()[])<<><>>}
+({{[(<([({((([()[]]{{}{}})[(<>{})([][])])){{({<><>}[()()]){<{}[]>[<><>]}}}}{(<[<<>[]>]>><<[{()}<()()>]
+([{[[([{<[({{({}[]><[][]>}}((<()()>[<>[]])<({}())({}())>))]<[[[(<>{}){[]}]{{[][]}{()[]}}]]<{<<{}<>><<
+({{<[[({{((<[{()<>}[{}[]]]([[]()](()[]))>{[{()[]}{{}[]}][{{}{}}{[]{}}]})({{[{}](<><>)}[([]()
+[<<{[{({{[[{{<[]{}>[<>[]]}<({}[])[()[]]>>{[[<>()]{{}[]}][{[]{}}{[]()}]}][<<([]()){[]<>}>((<>){{}()})>[{{{}(
+(<{[{<{[[[<[<{{}<>}<()>>{[<><>][()()]}][<[<>()]{{}{}}>([[]())[[]<>])]>]{[(<[()()]{<><>}>{[{}[]]<
+<{[[[{(({{<({(()[])(<>{})}(<[][]>[<>]))({([]<>)<<>[]>}<[<><>][()()]>)>[<[[<><>][()()]](<()>[()<>]
+[<[([[<<[{((<[<>{}][{}[]]><(<>{}){[]<>}>))}][{{<<<[][]><{}<>>>><({()[]}<()[]>)>}<([<(){}>({}())]<[{}][()]>)[
+[([({{[[{{[[{{{}{}}<[]<>>}]]<{{{{}{}}<<>()>}((()())({}[]))}[[<(){}>(<>{})][[<>{}]{{}<>}]]>
+<<[{<<([[({([[[][]]{{}()}])[[{{}[]}<{}()>]{[(){}]{<>[]}}]}([{{[][]}>]<{{()[]}<()[]>}<(()<>)
+[[[{(<[[{(({<({}())>{{<>{}}[{}{}]]}<{{()()}[{}<>]}[<{}<>>(<><>)]>))<<<{<<>[]>}{[{}()][{}{}]}>[<[(){}][{}{}
+{<([{[[([{[{(<()()><<>[]>)(({}{})[{}<>])}[<<()[]>[()<>]>{({}<>){()()}}]]<<{(<>[]){()()}}<{{}[]}(<><>)>>((
+(({{<(<({[[{({{}[]}([][]))[{[]<>}<<>[]>]}[<{[]{}}([])>]]{{([<>[]]({}()))(<()<>>{[]{}})}}][{<<{<>()
+{{[<[<(([<{[([()()][[]<>])[<()<>>{()[]}]]}>[{({{()()}([][])}({()}(()<>)))[[({}())]{{<>()}[<>]}]}]]{<{({({
+{{([([({[<((<{<><>}>{(<>[])})([({}{}){<>()}]))<[{<{}{}>{<>[]}}]<(<(){}>{()<>}){<<><>>}>>>[{[
+[<{<[(<{{[((<[<><>]{(){}}>(([]<>)[()()]))(<{{}()}[{}[]]>{<<><>>{()<>}}))({[<()()>{<><>}]<{[]<
+<((([(<[{<<[<<<>()>({})>][((()[]))<{{}()><<><>>>]>>({[[[<>{}][<><>]]({{}()}<{}{}>)]}((<<[]>
+[[{({[({[[[[<[<>()]{<>{}}>]{([<>{}](()<>))[[{}<>]({}[])]}]{{{(<>{})({}[]]}}[{[()<>]{()()}}]}]]<<{[((<>())<()<
+{<{{{([(<([<[{<>()}{<>{}}]<([]{})<[][]>>>([<(){}>[[][]]]{<()<>><<>[]>})]<<<[()()]>>[([()()]
+[([[(({[[{{<{(<>{})<(){}>}[({}{})[<><>]]>({<<>{}>[<>{}]})}}[[<{<()><{}{}>}{{<><>}}>([[()()]{{
+{{[({({([([<({()}([]()))>[[(<>[]){<><>}][{[]{}]<{}>]]]{{[({}{}){<><>}][[[]<>][<>[]]]}((([]<
+{{<<[<<(({[[{{{}()}({}{})}<{()[]}{()()}>][{{<>{}}[()<>]}([{}[]]{{}[]})]]<[{{[]<>}{<>{}}}{[<>[]]<[][]>}]
+[{<({({<{{({{{<>{}}<{}()>}{(<>())[<>{}]}}[(<<>{}>[{}])])((<<<><>><{}()>>(<<><>>([])))(<([]<>)>{{
+{[<[((<{{[{{<({}{})>}<((<>)<[]<>>)[[<>()]{{}}]>}]}}>))]({[{{([[<<<{}[]>><<<>()><<>[]>>>[{{(){}}}<[[]{}]({}
+<<<[<({[(<(<<(()<>)<{}{}>>{([]<>){<>{}}}>{{<{}<>>(<>{})}<[()<>]>})<{[({}())[<>[]]]({<>()}<<>{}>)><{
+({<<[{<<[{{<([(){}]<<>()>)<<<>()>[[]()]>>(<{<>()}([]())>{[[]<>](<>{})})}}]]{<(<<[<<><>>((){})]{
+<([{{[{<<[[{{[{}[]][()]}<[{}()][[][]]>}}[<{[<>[]]{{}()}}>{(<()()><[][]>)({()<>})}]]<[<[<{}<>>([]<>)
+([<<[[([(<<[({()<>})<{[]()}{()}>]({{()<>}})>{[([<>()]([]()))[{[]{}}]]}>{{{(<[]()><[]>)<{{}{}}[{
+([[{[[{<{[{<({()()}[<>{}])<<{}{}><<>()>>><[[<>{}](<>()]]<<[][]>{<>{}}>>}][<{(<<>()>[()[]])<{<>{}}
+<{<<{<((([{[<(())<{}[]>>]<(<{}()><<>{}>)<<<>{}>>>}<{{<<>()>{{}()}}<<(){}>>}[[{[]()}({}())]((<>
+([[([(<[<<{[<[()<>][[]()]>[[[]<>]<()()>]][[(<><>)]<<<>>(<>[])>]}><{([(<><>)]{[()<>}})}>><<[[(<
+{{(<<({<([([{{[]()}}([<>{}]{{}()})])])[[[[[[<>{}>({}())]{{[]{}}({}())}]]([{{<>}(()<>)}[{<>()}<[][]>]])](<[[[
+((({{<[<<{{{<<[]()>[<>[]]>[({}[])([]{})]}<<[[]{}]<()<>>><({}())(())>>}[<<[(){}]<[]()>>[{{}<>}
+[<([<{[([[[(<[<>{}]({}{})>([()[]]({})))([{()()}{()[]}]<[<><>]{()()}>)]({({(){}}{<><>})<[<>()]{{}()
+<(({(<[[{[{[((<>())[{}])[[<>]{<>()}]](<{[][]}{<>()}>([<>{}>{[]<>}))}[[({<>{}}{<>()})((()[])<<>
+<{{{{<{[[<[({{<>[]}(()<>)})<(<<>{}>[(){}])[{<>{}}{<>{}}]>]({[{<>()}<()<>>]{<[]()><{}()>}}([
diff --git a/2021/day10/input.txt.sample b/2021/day10/input.txt.sample
new file mode 100644
index 0000000..2f182d8
--- /dev/null
+++ b/2021/day10/input.txt.sample
@@ -0,0 +1,10 @@
+[({(<(())[]>[[{[]{<()<>>
+[(()[<>])]({[<{<<[]>>(
+{([(<{}[<>[]}>{[]{[(<()>
+(((({<>}<{<{<>}{[]{[]{}
+[[<[([]))<([[{}[[()]]]
+[{[{({}]{}}([{[{{{}}([]
+{<[[]]>}<{[{[{[]{()[[[]
+[<(<(<(<{}))><([]([]()
+<{([([[(<>()){}]>(<<{{
+<{([{{}}[<[[[<>{}]]]>[]]
\ No newline at end of file
diff --git a/2021/day9/9a.py b/2021/day9/9.py
similarity index 100%
rename from 2021/day9/9a.py
rename to 2021/day9/9.py
diff --git a/README.md b/README.md
index 28a344d..0c8d07a 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 my solutions for the [Advent of Code](https://adventofcode.com/)
 
 in progress:\
-2021 (python)\
+2021 (python)
 
 planned:\
 2022 (rust)\