import java.util.Scanner;

public class YukiCoder {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		StringBuilder S = new StringBuilder(s.nextLine());
		s.close();
		StringBuilder str = new StringBuilder("yukicoder");
		int i = S.indexOf("?");
		System.out.println(str.charAt(i));

	}
}