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

c = c1 + c2
i = 0
j = 1

for value in c:
	if value == 'o':
		i += 1
	else:
		if i > j:
			j = i
		i = 1
if i == 14 or i == 0:
	print (i)
else:
	print(j)