# coding:utf-8

c0 = input()
c1 = input()
c = c0 + c1
count = 0
ans = []
for i in list(c):
    if i == 'o':
        count += 1
    else:
        ans.append(count)
        count = 0
    # print(i)
ans.append(count)
print(max(ans))