import sys

sys.setrecursionlimit(10 ** 6)
int1 = lambda x: int(x) - 1
p2D = lambda x: print(*x, sep="\n")
def MI(): return map(int, sys.stdin.readline().split())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]

def main():
    s=input()
    t=input()
    ans=0
    cnt=0
    for c in s+t:
        if c=="o":
            cnt+=1
        else:
            if cnt>ans:ans=cnt
            cnt=0
    if cnt > ans: ans = cnt
    print(ans)

main()