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

class Program
{
    public void Solve()
    {
        List<char> week = new List<char>();
        week.AddRange(Console.ReadLine().ToArray());
        week.AddRange(Console.ReadLine().ToArray());

        int holidayCnt = 0;
        int longHoliday = 0;
        for (int i = 0; i < week.Count(); i++)
        {
            if (week[i] == 'o') { holidayCnt++; }
            else
            {
                if (longHoliday < holidayCnt) { longHoliday = holidayCnt; }
                holidayCnt = 0;
            }
        }
        if (longHoliday < holidayCnt) { longHoliday = holidayCnt; }

        Console.WriteLine(longHoliday);
    }

    static void Main()
    {
        var solver = new Program();
        solver.Solve();
    }
}