import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String BASE = "yukicoder";
        char[] arr = sc.next().toCharArray();
        for (int i = 0; i < arr.length; i++) {
            if (arr[i] == '?') {
                System.out.println(BASE.charAt(i));
                return;
            }
        }
    }
}