lines = []
for l in open("input.txt", 'r').read().splitlines():
	p = l.split(" -> ")
	q = []
	q.append(p[0].split(","))
	q.append(p[1].split(","))
	lines.append([[int(q[0][0]),int(q[0][1])],[int(q[1][0]), int(q[1][1])]])
grid = [[0 for i in range(1000)] for j in range(1000)]
overlaps = 0

for l in lines:
	xDir = 0
	yDir = 0
	if l[0][0] > l[1][0]:
		xDir = -1
	if l[0][0] < l[1][0]:
		xDir = 1
	if l[0][1] > l[1][1]:
		yDir = -1
	if l[0][1] < l[1][1]:
		yDir = 1
	if xDir == 0:
		for i in range(l[0][1],l[1][1]+yDir,yDir):
			grid[l[0][0]][i] += 1
			if grid[l[0][0]][i] == 2:
				overlaps += 1
	if yDir == 0:
		for i in range(l[0][0],l[1][0]+xDir,xDir):
			grid[i][l[0][1]] += 1
			if grid[i][l[0][1]] == 2:
				overlaps += 1
	
	
print(overlaps)