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

namespace Yukicoder
{
    class Program
    {
        static void Main(string[] args)
        {
            var isOda = Console.ReadLine() == "oda";
            var sum = 0;
            for (int i = 0; i < 8; i++)
            {
                sum += Console.ReadLine().ToCharArray().Count(element => element != '.');
            }
            if (sum%2 != 0)
            {
                isOda = !isOda;
            }
            Console.WriteLine(isOda ? "oda" : "yukiko");
        }
    }
}