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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            bool isSaki = true;
            string saki = Console.ReadLine();
            string str = "";
            for (int i = 0; i < 8; i++)
            {
                str += Console.ReadLine();
            }

            for (int i = 0; i < str.Length; i++)
            {
                if (str[i] == 'w' || str[i] == 'b')
                {
                    isSaki = (isSaki) ? false : true;
                }
            }

            string ans;
            if (isSaki)
            {
                ans = saki;
            }
            else
            {
                ans = (saki == "oda") ? "yukiko" : "oda";
            }

            Console.WriteLine(ans);
        }
    }
}