import java.util.*;

	public class Main {
		public static void main(String[] args) {
			Scanner sc = new Scanner(System.in);
			String s = "";
			int countR = 0;
			int countB = 0;

			for ( int i = 0; i < 3; i++ ){
				s = sc.next();
				if ( s.equals("RED")) countR++;
				else if ( s.equals("BLUE")) countB++;
			}
			if( countB > countR) System.out.println("BLUE");
			else System.out.println("RED");

			sc.close();
		}
	}