import java.util.Scanner;
public class Main{
	private static Scanner sc=new Scanner(System.in);
	public static void main(String args[])throws Exception{
		int r=0,b=0;
		for(int i=0;i<3;i++){
			if(sc.nextLine().equals("RED"))r++;
			else b++;
		}
		if(r<b)System.out.println("BLUE");
		else System.out.println("RED");
	}
}