f = input()
s = input()
f = f + s

max = 1
count = 1

if not "o" in f:
    print("0")
else:
    for i in range(len(f) - 1):
        if f[i] == "o":
            if f[i + 1] == f[i]:
                count += 1
                if count >= max:
                    max = count
            else:
                count = 1
    print(max)