import java.util.*;

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