using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static void Main()
    {
        var c = NList;
        var a = c[0] * 1000L;
        var b = c[1] * 3600L;
        if (a > b) WriteLine("KoD");
        else if (a < b) WriteLine("blackyuki");
        else WriteLine("same");
    }
}