fn main() {
    let mut input = String::new();
    std::io::Read::read_to_string(&mut std::io::stdin(), &mut input).ok();
    let input: Vec<String> = input
        .split_whitespace()
        .map(|n| n.parse().unwrap())
        .collect();

    if input.iter().filter(|&s| s == "RED").count() >= 2 {
        println!("RED");
    } else {
        println!("BLUE");
    }
}