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

class Program
{
    static void Main(string[] args)
    {
        decryptFile(args[0], args[1]);
    }

    static void decryptFile(string inputFile, string outputFile)
    {
        string key = "h3y_gUyZ";
        UnicodeEncoding unicodeEncoding = new UnicodeEncoding();
        byte[] bytes = unicodeEncoding.GetBytes(key);
        FileStream inputFileStream = new FileStream(inputFile, FileMode.Open);
        RijndaelManaged rijndaelManaged = new RijndaelManaged();
        CryptoStream cryptoStream = new CryptoStream(inputFileStream, rijndaelManaged.CreateDecryptor(bytes, bytes), CryptoStreamMode.Read);
        FileStream outputFileStream = new FileStream(outputFile, FileMode.Create);
        int num;
        while ((num = cryptoStream.ReadByte()) != -1)
        {
            outputFileStream.WriteByte((byte) num);
        }
        outputFileStream.Close();
        cryptoStream.Close();
        inputFileStream.Close();
    }
}