using System;
public class Program
{
    public static void Main()
    {
        //int num = int.Parse(Console.ReadLine() ?? string.Empty);
        //string[] str = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        string str = Console.ReadLine() ?? string.Empty;
        string str2 = Console.ReadLine() ?? string.Empty;

        int count = 0;

        int count2 = 0;

        string s = str + str2;

        for (int i = 0; i < s.Length; i++)
        {
            if (s[i] == 'o')
            {
                count++;
            }
            else if (s[i] == 'x' && count >= 1 && count2 < count)
            {
                count2 = count;
                count = 0;
            }
            else
            {
                count = 0;
            }
        }
        if (count >= 1 && count2 < count)
        {
            count2 = count;
        }
        Console.WriteLine(count2);
    }
}