using System;
using System.Text;
using System.Security.Cryptography;

namespace first
{
	class MainClass
	{
		public static void Main (string[] args)
		{
			string Company = "ABCD";
			string CompanyID = "1234";
			string ActivationCode = MainClass.Formula(Company, CompanyID);
			Console.WriteLine (ActivationCode);
		}

		public static string Formula (string Company, string CompanyID)
		{
			string Md5 = EncodeString(CompanyID.Trim() + Company.Trim());
			string HexMd5 = Md5.Substring(0, 10);
			long DecMd5 = Math.Abs(long.Parse(HexMd5, System.Globalization.NumberStyles.HexNumber));
			string ActivationCode = DecMd5.ToString();
			return ActivationCode.Substring(0,7) + '-' + ActivationCode.Substring(7);
		}

		public static string EncodeString(string password)
		{
			string md5encoded;
			using (MD5 md5 = new MD5CryptoServiceProvider())
			md5encoded = BitConverter.ToString(md5.ComputeHash(Encoding.UTF8.GetBytes(password)));
			return md5encoded.Replace("-", String.Empty);
 		}
	}
}