using System;

using System.Collections.Generic;

using System.Globalization;

using System.Linq;

using System.Text;

public class Program

{

    private static readonly byte[] PswXORmask = new byte[33]

        {

            (byte) 102,

            (byte) 20,

            (byte) 62,

            (byte) 119,

            (byte) 248,

            (byte) 228,

            (byte) 169,

            (byte) 251,

            (byte) 244,

            (byte) 176,

            (byte) 204,

            (byte) 201,

            (byte) 47,

            (byte) 142,

            (byte) 184,

            (byte) 19,

            (byte) 126,

            (byte) 19,

            (byte) 236,

            (byte) 0,

            (byte) 6,

            (byte) 16,

            (byte) 17,

            (byte) 9,

            (byte) 249,

            (byte) 145,

            (byte) 172,

            (byte) 20,

            (byte) 153,

            (byte) 140,

            (byte) 58,

            (byte) 215,

            (byte) 0

        };

    private static string DecodePassword(string value)

    {

        int num = value == null ? -1 : value.Length;

        if (num % 2 != 0)

            return "";

        string str = "";

        for (int index = 0; index < num / 2; ++index)

        {

            char ch1 = value[index * 2];

            char ch2 = value[index * 2 + 1];

            if (ch1 >= '0' && ch1 <= 'F' && ch2 >= '0' && ch2 <= 'F')

            {

                char ch3 = Convert.ToChar((int)byte.Parse(ch1.ToString() + ch2.ToString(), NumberStyles.HexNumber) ^ (int)PswXORmask[index % 33]);

                str += ch3.ToString();

            }

        }

        return str;

    }

    private static string EncodePassword(string value)

    {

        if (string.IsNullOrEmpty(value))

            return "";

        string str = "";

        int len = value.Length;

        for (int i = 0; i < len; i++)

        {

            char ch1 = value[i];

            int mask = (int)PswXORmask[i%33];

            string hex = ((int)ch1 ^ mask).ToString("X2");

            str += hex;

        }

        return str;

    }

    public static void Main()

    {

        Console.WriteLine(EncodePassword("Hello World"));

    }

}