import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s1 = sc.next();
		String s2 = sc.next();
		String s3 = sc.next();
		int red = 0; int blue = 0;
		if (s1.equals("RED")) {
			red++;
		} else {
			blue++;
		}
		if (s2.equals("RED")) {
			red++;
		} else {
			blue++;
		}
		if (s3.equals("RED")) {
			red++;
		} else {
			blue++;
		}
		if (red > blue) {
			System.out.println("RED");
		} else {
			System.out.println("BLUE");
		}
	}
}