/*

input: hello, output: olleh

input: hello world, output: dlrow olleh

*/

​

​

using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        string hello = "hello world";

        char[] charArray = hello.ToCharArray();

        List<char> reversed = new List<char>();

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

        {

            reversed.Add(charArray[i]);

        }

        foreach(char elem in reversed)

        {

            Console.Write(elem);

        }

    }

}