using System;

public class Program {
	public void Solve() {
		int red = 0;
		for (int i = 0; i < 3; i++) {
			if (Console.ReadLine().Equals("RED")) {
				red++;
			}
		}
		if (red >= 2) {
			Console.WriteLine("RED");
		} else {
			Console.WriteLine("BLUE");
		}
	}
	
	public static void Main(string[] args) {
		Program program = new Program();
		program.Solve();
	}
}