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

namespace yukicoder_516 {
    class Program {
        static void Main(string[] args) {
            string[] s = new string[3];
            int count = 0;
            for(int i = 0; i < s.Length; i++) {
                s[i] = Console.ReadLine();
                if (s[i] == "RED") {
                    count++;
                }
            }
            if (count > 1) {
                Console.WriteLine("RED");
            } else {
                Console.WriteLine("BLUE");
            }
            Console.ReadLine();
        }
    }
}