# import sys; input = sys.stdin.buffer.readline
# sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	l = []
	c = list(input())
	l += c
	c = list(input())
	l += c
	ans = 0
	val = 0
	for i in range(14):
		if l[i] == "o":
			val += 1
			ans = max(ans, val)
		else:
			val = 0

	print(ans)




if __name__ == '__main__':
	main()