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

class Magatro
{
    static void Main()
    {
        string ss = Console.ReadLine() + Console.ReadLine();
        int[] q = ss.Split('x').Select(s => s.Length).ToArray();
        Console.WriteLine(q.Max());
    }
}