import java.util.*;
public class WhoIsNext{
	public static void main(String... args){
		Scanner scan = new Scanner(System.in);
		String f = scan.next();
		StringBuilder sb = new StringBuilder();
		for(int i = 0; i < 8; i++){
			sb.append(scan.next());
		}
		String base = sb.toString();
		System.out.println(checkWhoIsNext(f,base));
	}
	public static String checkWhoIsNext(String f,String base){
		int count = 0;
		String next="";
		if(f.equals("oda")){
			next="yukiko";
		}else{
			next="oda";
		}
		for(int i = 0; i < base.length(); i++){
			if(base.substring(i,i+1).equals("w") || base.substring(i,i+1).equals("b")){
				count++;
			}
		}
		return (count%2==0)? f:next;
	}
}