def main():
    C = ''.join([input() for _ in [0] * 2])

    i = 0
    max_ = 0
    for s in C:
        if s == 'o':
            i += 1
        else:
            max_ = max(max_, i)
            i = 0
    else:
        max_ = max(max_, i)

    print(max_)

main()