import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		String sente = sc.next();
		int count = 0;
		for (int i = 0; i < 8; i++) {
		    for (char c : sc.next().toCharArray()) {
		        if (c == '.') {
		            count++;
		        }
		    }
		}
		if (count % 2 == 0) {
		    if (sente.equals("oda")) {
		        System.out.println("oda");
		    } else {
		        System.out.println("yukiko");
		    }
		} else {
		    if (sente.equals("oda")) {
		        System.out.println("yukiko");
		    } else {
		        System.out.println("oda");
		    }
		}
	}
}