class Program
{
    static void Main(string[] args)
    {
        int redCount = 0;
        for (int i = 0; i < 3; i++)
        {
            string color = Console.ReadLine()!;
            if (color == "RED")
            {
                redCount++;
            }
        }

        if (redCount >= 2)
        {
            Console.WriteLine("RED");
        }
        else
        {
            Console.WriteLine("BLUE");
        }
    }
}