package net.ipipip0129.yukicoder.no88;

import java.util.Arrays;
import java.util.Scanner;

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

        boolean isStarterOda = scan.nextLine().equalsIgnoreCase("oda");

        int cnt = 0;
        for (int i = 0; i < 8; i++) {
            String line = scan.nextLine();
            cnt += Arrays.stream(line.split(""))
                    .filter(s -> s.matches("[wb]"))
                    .toArray().length;
        }

        System.out.println(cnt % 2 == 0 ? isStarterOda ? "oda" : "yukiko" : isStarterOda ? "yukiko" : "oda");
    }
}