# -*- coding: utf-8 -*-
A = [""] * 2
A[0] = raw_input()
A[1] = raw_input()

# 番兵
A[1] += "_"

current = "x"
count = 0
mx = 0

for c in (A[0] + A[1]):
    if c == "o":
        count += 1
    else:
        count = 0
    current = c
    mx = max(mx, count)

print mx