using System;

using System.Security.Cryptography;

using System.Linq;

public class Program

{

    // Randomly generated salt. DO NOT CHANGE UNTIL THE END OF TIME.

    private static readonly byte[] _salt = new byte[] { 56, 112, 43, 68, 1, 200, 213, 185, 83, 62, 158, 201 };

    public static string GenerateInstallKey()

    {

        // MD5( MD5( Day of Year ) + MD5( Year ) + Salt ).

        using (MD5 md5 = MD5.Create())

        {

            var dayOfYear = md5.ComputeHash(BitConverter.GetBytes(DateTime.UtcNow.DayOfYear));

            var year = md5.ComputeHash(BitConverter.GetBytes(DateTime.UtcNow.Year));

            return BitConverter.ToString(md5.ComputeHash(md5.ComputeHash(dayOfYear.Concat(year).Concat(_salt).ToArray()))).Replace("-", string.Empty).Substring(0, 16);

        }

    }

    public static void Main()

    {

        Console.WriteLine(new string(GenerateInstallKey().Select(T => T + 1).Select(T => (char)T).ToArray()).ToLower());

    }

}