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

namespace ForYukicoder
{
    class Program
    {
        static void Main(string[] args)
        {
            string S = Console.ReadLine();
            string[] B = new string[8];

            for (int i = 0; i < 8; i++)
            {
                B[i] = Console.ReadLine();
            }

            //-----------------

            int stone = 0;

            foreach (var row in B)
            {
                foreach (var column in row)
                {
                    if (column == 'w' || column == 'b') stone++;
                }
            }

            string str;
            if (stone % 2 == 0)
            {
                //黒の順番
                str = S;
            }
            else
            {
                //白の順番
                str = (S == "oda") ? "yukiko" : "oda";
            }

            Console.WriteLine(str);
        }
    }
}