using System;

using System.Collections.Generic;

public class Program

{

    public void Main()

    {

        var str = @")<39+•)e$9yn""'••••#*""""vPaO•L•^T_f684•VSYO9:9CKQ•NXfE'AZ[JW]/>6z•VSYO.G'CO\S•Y9t0DYa•\K5IeCU•WJW0C/BIR•FL6J:nM\TI•6AlnJN^X•fD;A•RRFS3t/B•ynIY;C+CLVIIV,t'C•RSYO*=9>RbYNY5He3Ua•HY4•RX";

        var cipher = new Cipher();

        var decoded = cipher.Decode(str);

​

        Console.WriteLine(decoded);

    }

}

​

class Cipher

{

    private const string salt = "NETFiddle";

    public string Decode(string mess) {

        var outputChars = new string[mess.Length];

        var i = 0;

        for(i=0;i<mess.Length;i++)

        {

            var saltCharCode = GetSaltCharCode(i);

            var charCode = Char.ConvertToUtf32(mess,i);

            var sumCharCode = charCode-saltCharCode;

​

            if(sumCharCode< 0) sumCharCode+=127;

            outputChars[i]=Char.ConvertFromUtf32(sumCharCode);

​

        }

​

        return String.Join("",outputChars);

    }

    private int GetSaltCharCode(int i) {

        var saltChars = salt.ToCharArray();

        Array.Reverse(saltChars);

        while(i>=saltChars.Length)

        {

            i = i-saltChars.Length;

        }

        return Char.ConvertToUtf32(saltChars[i].ToString(),0);

    }

}