C = input() + input()
r = [1] * 14
c = 0
for i in range(1, 14):
    if C[i] == "x":
        c += 1
        continue
    if C[i - 1] == "o"  and C[i] == "o":
        r[c] += 1
print(max(r) if max(r) != 1 else 0)