using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Console.WriteLine("Enter text to encrypt");

            string txt2Encrypt = Console.ReadLine();

            var encrpytedText =  Encrpyt(txt2Encrypt);

            Console.WriteLine("Encrpted text: " + encrpytedText);

    }

       public static string Encrpyt(string textToEncrypt)

        {

            string alphabets = "abcdefghijklmnopqrstuvwxyz";

            string encryptedText = string.Empty;

            char[] textToEncryptCharArray = textToEncrypt.ToLower().ToCharArray();

            int index = 0;

            int encrpytedInt = 0;

            foreach (var chr in textToEncryptCharArray)

            {

                index = alphabets.IndexOf(chr) + 1;

                if (index % 2 == 0)

                {

                    encrpytedInt = index / 2;

                    encryptedText += "e" + encrpytedInt;

                }

                else

                {

                    encrpytedInt = index * 3 + 1;

                    encryptedText += "o" + encrpytedInt;

                }

​

            }

            return encryptedText;

        }

}