#coding: UTF-8

import sys
import re
import itertools
from collections import deque

### defs ###


### main ###
C = sys.stdin.readline().strip('\r\n') + sys.stdin.readline().strip('\r\n')
ans=0
sz=len(C)
for i in range(sz):
	for j in range(i+1,sz+1):
		if (C[i:j].count('o')==j-i):
			ans = max(ans,j-i)

print(ans)