using System;

namespace Yuki
{
    class Program
    {
        static void Main(string[] args)
        {
            int r = 0;
            for (int i = 0; i < 3; i++)
            {
                if (Console.ReadLine() == "RED") r++;
            }
            string a = r >= 2 ? "RED" : "BLUE";
            Console.WriteLine(a);
        }
    }
}