#[allow(dead_code)]
pub mod nayuta {
    use std::{error, io, result};
    pub type Result<T> = result::Result<T, Box<dyn error::Error>>;

    fn input_string_line() -> Result<String> {
        let mut s: String = String::new();
        io::stdin().read_line(&mut s)?;
        Ok(s.trim().into())
    }

    fn input_values() -> Result<Vec<usize>> {
        let s: String = input_string_line()?;
        let v: Vec<usize> = s
            .split_ascii_whitespace()
            .map(|x: &str| x.parse::<usize>().map_err(|e| e.into()))
            .collect::<Result<_>>()?;
        Ok(v)
    }

    pub fn input_two_tuple() -> Result<(usize, usize)> {
        let v: Vec<usize> = input_values()?;
        Ok((v[0], v[1]))
    }
}

fn main() -> nayuta::Result<()> {
    let (a, b): (usize, usize) = nayuta::input_two_tuple()?;
    let (a, b): (f32, f32) = (a as f32, ((b * 3600) as f32) / 1000.0);

    println!(
        "{}",
        match () {
            _ if a > b => "KoD",
            _ if a < b => "blackyuki",
            _ => "same",
        }
    );

    Ok(())
}