W1 = input()
W2 = input()
W3 = list(W1+W2)
M = 0
Mmax = 0
for i in range(len(W3)):
    if W3[i] == "o":
        M += 1
        if Mmax < M:
            Mmax = M
    else:
        M = 0
print(Mmax)