using System;

public class Program

{

    public static void Main()

    {

        string encryptedText = @"!•*•+_,a-•.•/•*_+],l-@*";

        Console.WriteLine("Şifre: " + gizTextDecryption(encryptedText));

    }

    public static string gizTextDecryption(string EncryptedText)

{

    string text = "";

    ushort num = 0;

    try

    {

        if (EncryptedText != "")

        {

            int num2 = EncryptedText.Substring(0, EncryptedText.Length - 1).LastIndexOf("@");

            int num3 = char.ConvertToUtf32(EncryptedText.Substring(num2 + 1, 1), 0) - 32;

            if (EncryptedText[0] != '!' || num2 == 0 || num3 == 0)

            {

                return EncryptedText;

            }

​

            try

            {

                for (ushort num4 = 1; num4 <= num2 - 2; num4++)

                {

                    int num5 = num3 + num % 6 + 32;

                    text += char.ConvertFromUtf32(char.ConvertToUtf32(EncryptedText.Substring(num4, 1), 0) - num5);

                    num++;

                    if (EncryptedText[num4 + 1] == Convert.ToChar(num5))

                    {

                        num4++;

                    }

                }

​

                if (text.Length == num3)

                {

                    return text;

                }

​

                return EncryptedText;

            }

            catch

            {

                return EncryptedText;

            }

        }

​

        return EncryptedText;

    }

    catch

    {

        return EncryptedText;

    }

}

}