using System;
using System.Linq;

class No88{
    static void Main(){
        var first=Console.ReadLine();
        var second=(first=="oda")?"yukiko":"oda";
        var count=0;
        for(int i=0;i<8;++i){
            count+=(Console.ReadLine().Count(x=>x=='b'||x=='w'));
        }
        Console.WriteLine(count%2==0?first:second);
    }
}