/*No.516 赤と青の風船*/
import java.io.*;
public class No516 {
	public static void main(String[] args) {
		try(BufferedReader input =new BufferedReader(new InputStreamReader(System.in))){
			String [] H_balloon = new String[3];
			byte red=0,blue=0;
			for(int i=0;i<3;i++){
				H_balloon[i]=input.readLine();
			}
			for(int i=0;red<2&&blue<2;i++){
				if(H_balloon[i].equals("RED")){
					red++;
				}else{
					blue++;
				}
			}
			if(red>blue){
				System.out.println("RED");
			}else{
				System.out.println("BLUE");
			}
		}catch(Exception e){
			e.printStackTrace();
		}
	}
}