using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter string which you want to reverse...");

        string strinput = Console.ReadLine();

        ReverseString(strinput);

    }

    static void ReverseString (string newstrinput)

    {

        char[] chararray = newstrinput.ToCharArray();

        for(int i=0, j=chararray.Length-1; i<=j; i++,j--)

        {

                chararray[i]=newstrinput[j];

                chararray[j]=newstrinput[i];    

                //char c = chararray[i];

                //chararray[i] = chararray[j];

                //chararray[j] = c;

        }

        string revstring = new string(chararray);

        Console.WriteLine(revstring);

    }

}