using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

class Program
{
	static void Main()
	{
		List<string> Args = new List<string>()
		{
			Console.ReadLine(),
			Console.ReadLine(),
			Console.ReadLine()
		};

		if (Args.Where(x => x == "BLUE").Count() <= 1)
			Console.WriteLine("RED");
		else
			Console.WriteLine("BLUE");

	}
}