s = input()
t = input()
s = s+t
ans = 0
ma = 0
if s[0] == "o":
    ans += 1
    ma += 1
for i in range(1,14):
    if s[i] == "o":
        ans += 1
        ma = max(ma,ans)
    else:
        ans = 0
print(ma)