#!/usr/bin/env python
# -*- coding: utf-8 -*-

def main():

    first_week = input()
    second_week = input()
    
    day_list = first_week + second_week

    holidays = [len(i) for i in day_list.split("x")] 
    
    print(max(holidays))
    

if __name__ == '__main__':
    main()