fn main() {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    let s = s.trim().chars().collect::<Vec<_>>();

    let base = "yukicoder".chars().collect::<Vec<_>>();
    println!("{}", base[s.iter().enumerate().filter(|&(i, &c)| c == '?').nth(0).unwrap().0]);
}