using System;
using System.Linq;

public class P0516 {
    public static void Main() {
        var s1 = Console.ReadLine().Trim().Length;
        var s2 = Console.ReadLine().Trim().Length;
        var s3 = Console.ReadLine().Trim().Length;
        if(s1 + s2 + s3 > 10) {
            Console.WriteLine("BLUE");
        } else {
            Console.WriteLine("RED");
        }
    }
}