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


namespace yukicoder
{
    class Program
    {
        static void Main()
        {
            var s = Console.ReadLine();
            var name = (s == "oda") ? "yukiko" : "oda";
            var sum = 0;

            for (var i = 0; i < 8; i++)
            {
                var chk = Console.ReadLine();

                if (chk.Contains("b") || chk.Contains("w"))
                {
                    sum += chk.Where(x => x == 'w' || x == 'b').Count();
                }
            }

            Console.WriteLine(sum % 2 == 0 ? s : name);
            
        }
        
    }
}