using System;

public class Program

{

    public static void Main(string[] args)

    {

        string input = Console.ReadLine();

        if (IsPalindrome(input))

        {

            Console.WriteLine( " string is a palindrom");

        }

        else

        {

            Console.WriteLine("string is not a palindrom");

        }

    }

    public static bool IsPalindrome (string str)

    {

        string cleandstr = CleanString(str);

        int i = 0;

        int j = cleandstr.Length-1;

        while (1 < j)

        {

            if(cleandstr[i]!= cleandstr[j])

            {

                return false;

            }

            i++;

            j--;

        }

        return true;

    }

    public static string CleanString(string str)

    {

        char[] arr = str.ToLower().ToCharArray();

        arr= Array.FindAll(arr, c => char.IsLetterOrDigit(c));

        return new string(arr);

    }

}