import java.util.Scanner;

public class No88 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		int turn; //0=織田,1=ゆきこ
		if(S.equals("oda")) {
			turn = 0;
		}else {
			turn = 1;
		}
		int ishi = 0; //石の数

		for(int i = 0;i < 8;i++) {
			String str = sc.next();
			String B[] = str.split("");
			for(int j = 0;j < 8;j++) {
				if(B[j].equals("b") || B[j].equals("w")) {
					ishi++;
				}
			}
		}
		if(ishi % 2 != 0) {
			turn = (turn + 1) % 2;
		}
		if(turn == 0) {
			System.out.println("oda");
		}else {
			System.out.println("yukiko");
		}
	}
}