# -*- coding: utf-8 -*-
A = raw_input()
B = raw_input()
C = A + B
Clist = list(C)
cnt = 0
maxc = 0
for mark in Clist:
    if mark == "o":
       cnt += 1
       if maxc < cnt:
           maxc = cnt
    else:
        cnt = 0
print maxc