using System;

public class Program

{

    public static void Main()

    {

        // nhap 1 day so xuat ra day nguoc lại

        int n, t, S = 0, r;

        Console.WriteLine("Nhap so N :");

        n = int.Parse (Console.ReadLine());

        for ( t = n ; t != 0; t = t/10 )

        {

            r = t % 10;

            S = S*10 + r; 

        }

        Console.WriteLine("Sau khi dao nguoc {0} thi ta se co duoc {1} .",n,S );

    }

}