import java.util.*; import java.util.stream.Stream; public class No494 { public static void main(String[] args) { Scanner sc = new Scanner(System.in); String yukicoder = "yukicoder"; String s = sc.next(); for(int i = 0 ; i < s.length(); i++) { if(s.charAt(i) == '?') { System.out.println(yukicoder.charAt(i)); return; } } } }