using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        char[] C1 = Console.ReadLine().ToArray();
        char[] C2 = Console.ReadLine().ToArray();

        List<char> week = new List<char>();
        week.AddRange(C1);
        week.AddRange(C2);

        List<int> gw = new List<int>();
        int holidayCnt = 0;
        for (int i = 0; i < week.Count(); i++)
        {
            if (week[i] == 'o') { holidayCnt++; }
            else
            {
                gw.Add(holidayCnt);
                holidayCnt = 0;
            }
        }
        gw.Add(holidayCnt);

        Console.WriteLine(gw.Max());
    }
}