using System;

public class Hello
{
    public static void Main()
    {
        var s = Console.ReadLine().Trim() + Console.ReadLine().Trim();
        var ans = 0;
        bool pre;  int count;
        if (s[0] == 'o') { pre = true;  count = 1; }
        else { pre = false;  count = 0; }
        for (int i = 1; i < 14; i++)
            if (s[i] == 'o') { count++; pre = true; ans = Math.Max(ans, count); }
            else if (pre) { count = 0; pre = false; }
        Console.WriteLine(ans);
    }
}