using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Text.RegularExpressions;

​

public class Program

{

    public static void Main()

    {

        string input = "abala L*ANica1203.!ze{LEee"; //Console.ReadLine();  

        string output = string.Empty;

        char[] charr = input.ToCharArray();

        var reg =new Regex(@"[^ !""#$%&'()*+,-./0-9:;<=>?\[\\\]^_`{|}~]");

        var reg1 = new Regex()

        var result = reg.Replace(input, ".");

        bool a = Array.Exists(charr, element => element >= 'a' && element <= 'z');

        bool b = Array.Exists(charr, element => element >= 'A' && element <= 'Z');

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

        {

            if (a == true)

            { 

                result = Regex.Replace( input, "[a-z]", "[A-Z]");

            }

​

            if (b == true)

            {

                result = Regex.Replace(input,[A-Z],"[a-z]");

            }

​

            bool digit = char.IsDigit(input[i]);

            if (digit == true)

            {

                 result = Regex.Replace( input, "[0-9]", number);

            }

        }

        Array.Reverse(result);

​

        Console.WriteLine(result);

    /*foreach(int number in charr)

        {

        }*/

    }

}