c1 = str(input())
c2 = str(input())
C = c1+c2
cur = c1
cnt = 0
X = []
for c in C:
    if c == cur:
        cnt += 1
    else:
        X.append((cur, cnt))
        cnt = 1
        cur = c
else:
    X.append((cur, cnt))
ans = 0
for c, cnt in X:
    if c == 'o':
        ans = max(cnt, ans)
print(ans)