using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        ReverseString("nithya");

    }

    public static void ReverseString(string str){

        string resstr="";

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

            resstr=str[i]+resstr;   // correct nithya will reversed

        Console.WriteLine( resstr); 

            //resstr=str[i]+resstr;      //in this line nithya reverse we get 'a' missed

        }

        Console.WriteLine( resstr); 

    }

}