using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Numerics;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using static System.Math;

public static class P
{
    public static void Main()
    {
        while (true)
        {
            var n = int.Parse(Console.ReadLine());
            if (n == 0) break;
            Console.WriteLine("yukicoder"[n - 1]);
        }
    }
}