use proconio::input;

fn main() {
	input! {
		s1: String,
		s2: String,
		s3: String,
	}

    let red_count = [s1, s2, s3].iter().filter(|s| **s == "RED".to_string()).count();

    let ans = if red_count >= 2 {
        "RED"
    } else {
        "BLUE"
    };

	println!("{ans}");
}