import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String []S = new String[3];
		for(int i = 0; i < 3; i++) {
			S[i] = scan.next();
		}
		scan.close();
		int cnt1 = 0;
		for(int i = 0; i < 3; i++) {
			if(S[i].equals("BLUE")) {
				cnt1 ++;
			}
		}
		if(cnt1 > 1) {
			System.out.println("BLUE");
		}else {
			System.out.println("RED");
		}
	}
}