c1 = list(map(str, input().split()))
c2 = list(map(str, input().split()))

c = c1 + c2
i = 0
j = 0

for value in c:
	if c == 'o':
		i += 1
		if i > j:
			j = i
	else:
		if i > j:
			j = i
		i = 0
		
print(j)