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

class yc2
{
    static void Main()
    {
        string str1 = Console.ReadLine();
        string str2 = Console.ReadLine();
        int j = 0,cout = 0;
        int[] hd = new int[15];
        str1 += str2;

        char[] chs = str1.ToCharArray();

        for(int i = 0;i<chs.Length;i++)
        {
            if (chs[i] == 'x')
            {
                hd[j++] = cout;
                cout = 0;
            }
            else if (chs[i] == 'o')
            {
                cout++;
            }
            
        }
        hd[j++] = cout;
        Console.WriteLine(hd.Max());

    }
}