using System;

public class Program

{

    public static void Main()

    {

        var enterString = ""; // bbbaaa

        // aaabbb bbbaaa

        Console.WriteLine(Reverse(enterString));

    }

    public static string Reverse(string enterString){

        var reversedString = "";

        for(var i=enterString.Length - 1; i>=0; i--){

            reversedString = reversedString + enterString[i];

        }   

        return reversedString;

    }

}