import java.util.Scanner;

public class Test {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		String s = sc.next(), t, m = "";
		if (s.length() > 3) {
			t = "oda";
		} else {
			t = "yukiko";
		}
		for (int i = 0; i < 8; i++) {
			m += sc.next();
		}
		m = m.replaceAll("b", "").replaceAll("w", "");
		if (m.length() % 2 == 0) {
			System.out.println(s);
		} else {
			System.out.println(t);
		}
	}
}