// No.494 yukicoder
package main

import (
	"fmt"
	"strings"
)

func main() {
	var s string
	fmt.Scan(&s)

	idx := strings.Index(s, "?")
	for i, r := range "yukicoder" {
		if i == idx {
			fmt.Println(string(r))
			break
		}
	}
}