import java.util.*;
public class Main {
    public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		final String Sample = "yukicoder";
		int n = -1;
		while(n != 0){
			n = scan.nextInt();
			if(n == 0){
				break;
			}
			System.out.println(Sample.charAt(n-1));
			
		}
    }
}