# -*- coding:utf-8 -*-

if __name__ == "__main__":
	ans = 0
	now = 0
	a = raw_input()
	b = raw_input()
	a = a + b
	for i in a:
		if i == "o":
			now += 1
			if now > ans:
				ans = now
		else:
			if now > ans:
				ans = now
			now = 0
	print ans