import java.util.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		String s = sc.next();
		String[] ar = {"y","u","k","i","c","o","d","e","r"};
		for (int i=0; i<ar.length; i++) {
			if (s.charAt(i)=='?') {System.out.println(ar[i]); break;}
		}
	}
}