lines = open("input.txt", 'r').read().splitlines()

sum = 0

for l in lines:
    first = ""
    firstFound = False
    last = ""
    lastFound = False
    for i in range(len(l)):
        if not firstFound and l[i].isnumeric():
            first = l[i]
            firstFound = True
        if not lastFound and l[-i-1].isnumeric():
            last = l[-i-1]
            lastFound = True
        if firstFound and lastFound:
            break
    sum += int(first + last)
print(sum)