Encoder and Decoder

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

 

namespace Scores

{

    class Program

    {

        static void Main(string[] args)

        {

            string s = Console.ReadLine();

            if (!char.IsDigit(s[0]))//Encoder Section.

            {

                string s1 = "";

                string s2 = "";

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

                {

                    int ch = s[i];//Retreivimg the ASCII code of ith character.

                    s1 = s1 + ch.ToString();//COnctenating it into a string.

                }

                //Reversing the string of ASCII values.

                for (int i = s1.Length - 1; i >= 0; i--)

                {

                    s2 = s2 + s1[i];

                }

                Console.WriteLine(s2);

            }

            else//Decoder Section.

            {

                string s1 = "";

                string s2 = "";

                //Reversing the input encoded string.

                for (int j = s.Length - 1; j >= 0; j--)

                {

                    s1 = s1 + s[j];

                }

                int i = 0;

                while (i < s1.Length)

                {

                    int count = 0;

                    string s3 = "";

                    while (count < 2)//Taking two digits at a time.

                    {

                        s3 = s3 + s1[i];

                        i++;

                        count++;

                    }

                    count = int.Parse(s3);

                    if (count < 32)//Condition for taking three digits at a time.

                    {

                        s3 = s3 + s1[i];

                        i++;

                        count = int.Parse(s3);

                    }

                    s2 = s2 + char.ConvertFromUtf32(count);//Concatenating the character to the string.

                }

                Console.WriteLine(s2);

            }

        }

    }

}