import java.util.Scanner;

class no3004{
	public static void main(String[] args) {
		Scanner stdIn=new Scanner(System.in);
		int n;
		while(true) {
			n=stdIn.nextInt();
			if(n==0) break;
			if(n==1) System.out.println("y");
			else if(n==2) System.out.println("u");
			else if(n==3) System.out.println("k");
			else if(n==4) System.out.println("i");
			else if(n==5) System.out.println("c");
			else if(n==6) System.out.println("o");
			else if(n==7) System.out.println("d");
			else if(n==8) System.out.println("e");
			else System.out.println("r");
		}
	}
}