using System;

//using System.Collections.Generic;

using System.Linq;

//using System.Text;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("enter any sentence");

            string p = Console.ReadLine();

​

            int length = p.Length;

            int countSpaces = p.Count(Char.IsWhiteSpace);

            char[] original = new char[length-countSpaces];

            int position = 0;

            while(position<original.Length)

            {

                foreach (char c in p)

                {

                    char x = c;

                    bool a = Char.IsWhiteSpace(x);

​

                    if (!a)

                    {

                        original[position] = c;

                        position++;

​

                    }

                    else

                    {

                        continue;

                    }

                }

​

            }

            string orig = new string(original);

            char[] reverse = new char[original.Length];

            int j = original.Length - 1;

            int i = 0;

​

            while(j!=-1 && i<reverse.Length)

            {

                reverse[i] = original[j];

                j--;

                i++;

            }

            string reversedstring = new string(reverse);

            if (orig == reversedstring)

            {

                Console.WriteLine("\n" +p + " IS a palindrome : " );

            }

            else

            {

                Console.WriteLine("\n" + p + " IS NOT  a palindrome : ");

            }

​

            Console.WriteLine("\n-------------------------\n");

    }

}