using System;

​

class Program

{

    static void Main()

    {

        string input;

        do

        {

            Console.Write("escriu una paraula o frase: ");

            input = Console.ReadLine().ToUpper();

​

            if (input == "TENET")

                break;

​

            string processed = RemoveSpacesAndPunctuation(input);

            string reversed = ReverseString(processed);

            if (processed == reversed)

                Console.WriteLine("palíndrom");

            else

                Console.WriteLine("no palíndrom.");

        } while (true);

    }

​

    static string ReverseString(string text)

    {

        char[] array = text.ToCharArray();

        Array.Reverse(array);

        return new string(array);

    }

​

    static string RemoveSpacesAndPunctuation(string text)

    {

        char[] validChars = text.ToCharArray();

        string result = "";

        foreach (char c in validChars)

        {

            if (char.IsLetterOrDigit(c))

                result += c;

        }

        return result;

    }

}

​

​

​