import java.util.*;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
public class Reversi{
	public static void main(String[] arg){
		Scanner sc = new Scanner(System.in);
		int count=0,s=0;
		String first,in="";
		Pattern pb = Pattern.compile("b");
		Pattern pw = Pattern.compile("w");
		first = sc.next();
		for(int i = 0;i<8;i++){
			in = in + sc.next();
		}
		Matcher mb = pb.matcher(in);
		Matcher mw = pw.matcher(in);
		while(mb.find(s)){
			count++;
			s = mb.end();
		}
		s = 0;
		while(mw.find(s)){
			count++;
			s = mw.end();
		}
		if(first.equals("oda")){
			if(count %2 == 0){
				System.out.println("oda");
			}else{
				System.out.println("yukiko");
			}
		}else{
			if(count%2 == 0){
				System.out.println("yukiko");
			}else{
				System.out.println("oda");
			}
		}
	}
}