import java.util.Scanner;

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
    public static void main(String[] args) throws Exception {
        int a1 = 1;
        int b1 = 1;
        int c1 = 1;
        String ans = "0";
        Scanner s = new Scanner(System.in);
        String a = s.next();
        String b = s.next();
        String c = s.next();
        if (a == "BLUE"){
            a1 = -1;
        }
        if (b == "BLUE"){
            b1 = -1;
        }
        if (c == "BLUE"){
            c1 = -1;
        }
        if (a1+b1+c1<0){
            ans = "BLUE";
        }else{
            ans = "RED";
        }
        System.out.println(ans);

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String line = br.readLine();
    }
}