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

namespace y
{
	class a
	{
		static void Main(string[] args)
		{
			string[] s = Console.ReadLine().Split();
			long a = int.Parse(s[0]);
			long b = int.Parse(s[1]);
			a = a * 1000;
			b = b * 3600;

			string ans = "";

			if (a > b)
			{
				ans = "KoD";
			}
			else if (a < b)
			{
				ans = "blackyuki";
			}
			else
			{
				ans = "same";
			}

			Console.WriteLine(ans);
		}
	}
}