package e;

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		while(true) {
			int n = sc.nextInt();
			if (n == 0) {
				break;
			}
			System.out.println("yukicoder".charAt(n-1));
		}
	}

}