import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		new Main().run();
	}

	void run() {
		Scanner sc=new Scanner(System.in);
		String in=sc.next();
		String s = "yukicoder";
		for(int i=0;i<s.length();++i){
			if(in.charAt(i)=='?'){
				System.out.println(s.charAt(i));
			}
		}
	}

}