import java.util.Scanner;


public class Main_yukicoder88 {

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

        String s = sc.next();
        String[] oy = new String[2];
        oy[0] = s;
        oy[1] = s.equals("oda") ? "yukiko" : "oda";
        
        int cnt = 0;
        for (int i = 0; i < 8; i++) {
        	for (char e : sc.next().toCharArray()) {
        		if (e == 'b' || e == 'w') {
        			cnt++;
        		}
        	}
        }

        System.out.println(oy[cnt % 2]);

        sc.close();
    }
}