import java.util.*;
import java.util.stream.Stream;
import java.time.*;
import java.time.format.*;

public class No88 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        int count = 0;
        for(int i = 0; i < 8; i++) {
            count += sc.next().replace("." , "").length();
        }
        if(count % 2 == 0) {
            System.out.println(s);
        }else {
            if("oda".equals(s)) {
                System.out.println("yukiko");
            }else {
                System.out.println("oda");
            }
        }
	}
}