fn main() {
    let n: usize = input_value();

    if n < 1200 {
        println!("green");
    } else {
        println!("difficult");
    }
}

fn input_value<T>() -> T
where
    T: std::str::FromStr,
    <T as std::str::FromStr>::Err: std::fmt::Debug,
{
    let stdin = std::io::stdin();

    let mut buf = String::new();
    stdin.read_line(&mut buf).unwrap();
    buf = buf.trim_end().to_owned();

    let n = buf.parse().unwrap();

    n
}