using System;

public class Program

{

    public static void Main()

    {

        int flag=0; 

        Console.WriteLine("Enter String: ");

            string str = Console.ReadLine();

            string rev = "";

            int length = 0;

​

            foreach (var a in str)

                length++;

​

            for (int i = length-1; i >= 0; i--)

            {

                rev += str[i];

            }

            //Console.WriteLine(rev);

         for (int i = 0; i < length; i++)

            {

                if(str[i] == rev [i])

                {

                    flag = 1;

                }

                else

                    flag = 0;

            }

        if(flag == 1)

        {

            Console.WriteLine("Palindrome");

        }

        else

            Console.WriteLine("Not a Palindrome");

    }

}