using System;

​

public class Program

{

    public static string Caesar(string str)

    {

        string str2 = string.Empty;

        int a;

        for (int i = 0; i < str.Length; i++)

        {

            int p = Convert.ToInt32(str[i]);

            if (p == 32)

            {

                a = 32;

            }

            else

            {

                a = p + i;

                if (str[i] > 'a' && str[i] < 'z')

                {

                    if (a > 122)

                    {

                        a -= 26;

                    }

                }

​

                if (str[i] > 'A' && str[i] < 'Z')

                {

                    if (a > 90)

                    {

                        a -= 26;

                    }

                }

            }

​

            str2 += Convert.ToChar(a);

        }

​

        return str2;

    }

​

    public static string deCaesar(string str)

    {

        string str2 = string.Empty;

        int a;

        for (int i = 0; i < str.Length; i++)

        {

            int p = Convert.ToInt32(str[i]);

            if (p == 32)

            {

                a = 32;

            }

            else

            {

                a = p - i;

                if (str[i] > 'a' && str[i] < 'z')

                {

                    if (a < 97)

                    {

                        a += 26;

                    }

                }

​

                if (str[i] > 'A' && str[i] < 'Z')

                {

                    if (a < 65)

                    {

                        a += 26;

                    }

                }

            }

​

            str2 += Convert.ToChar(a);

        }

​

        return str2;

    }

​

    public static string rndABC()

    {

        string start = "abcdefghijklmnopqrstuvwxyz";

        char[] arrStart = ("abcdefghijklmnopqrstuvwxyz").ToCharArray();

        Random rnd = new Random();

        for (int i = 0; i < start.Length; i++)

        {

            int j = rnd.Next(i, start.Length);

            char temp = arrStart[i];

            arrStart[i] = arrStart[j];

            arrStart[j] = temp;

        }

​

        string arrFinal = string.Empty;

        for (int i = 0; i < start.Length; i++)

        {

            arrFinal += arrStart[i];

        }

​

        return arrFinal;

    }

​

    public static string Permutacija(string str)

    {

        string str2 = string.Empty;

        char[] arrBase = ("abcdefghijklmnopqrstuvwxyz").ToCharArray();

        char[] arrKey = (rndABC()).ToCharArray();

        for (int i = 0; i < str.Length; i++)

        {

            string p = "";

            if (str[i] == ' ')

            {

                p = " ";

            }

            else

            {

                for (int j = 0; j < arrBase.Length; j++)

                {

                    if (str[i] > 64 && str[i] < 91)

                    {

                        string basse = Convert.ToString(arrBase[j]);

                        if (str[i] == Convert.ToChar(basse.ToUpper()))

                        {

                            p = Convert.ToString(arrKey[j]).ToUpper();

                        }

                    }

​

                    if (str[i] > 96 && str[i] < 123 && str[i] == arrBase[j])

                    {

                        p = Convert.ToString(arrKey[j]);

                    }

                }

            }

​

            str2 += p;

        }

​

        return str2;

    }

​

    public static string dePermutacija(string str)

    {

        string str2 = string.Empty;

        string arrBase = "abcdefghijklmnopqrstuvwxyz";

        string arrKey = rndABC();

        for (int i = 0; i < str.Length; i++)

        {

            string p = "";

            if (str[i] == ' ')

            {

                p = " ";

            }

            else

            {

                for (int j = 0; j < arrBase.Length; j++)

                {

                    if (str[i] > 64 && str[i] < 91)

                    {

                        string key = Convert.ToString(arrKey[j]);

                        if (str[i] == Convert.ToChar(key.ToUpper()))

                        {

                            p = Convert.ToString(arrBase[j]).ToUpper();

                        }

                    }

​

                    if (str[i] > 96 && str[i] < 123 && str[i] == arrKey[j])

                    {

                        p = Convert.ToString(arrBase[j]);

                    }

                }

            }

​

            str2 += p;

        }

​

        return str2;

    }

​

    public static void Main()

    {

        string s = Console.ReadLine();

        Console.WriteLine("Prvo se cezarom dobije: ");

        Console.WriteLine(Caesar(s));

        Console.WriteLine("Zatim se permutacijom dobije: ");

        Console.WriteLine("abcdefghijklmnopqrstuvwxyz");

        Console.WriteLine(rndABC());

        string n = Permutacija(Caesar(s));

        Console.WriteLine(n);

        Console.WriteLine("~~~~DESIFROVANJE~~~");

        Console.WriteLine(dePermutacija(n));

        Console.WriteLine(deCaesar(dePermutacija(n)));

    }

}