import java.util.Scanner;

public class No516 {

    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        int blue = 0;
        for (int i = 0; i < 3; i++) {
            if (s.next().equals("BLUE")) {
                blue++;
            }
        }
        if (blue >= 2) {
            System.out.println("BLUE");
        } else {
            System.out.println("RED");
        }
    }
}