using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        String novaFrase = "";

        Console.Write("Insira uma frase: ");

        String frase = Console.ReadLine();

        List<String> split = new List<String>();

        for(int i = 0; i < frase.Length; i++) {

            if(char.IsLetterOrDigit(frase[i]) && !char.IsWhiteSpace(frase[i]) && frase[i].ToString() != "") {

                split.Add(frase[i].ToString());

                novaFrase += frase[i];

            }

        }

        split.Reverse();

        if(novaFrase.ToLower() == string.Join("", split.ToArray()).ToLower()) {

            Console.WriteLine("Funcionou");

        } else {

            Console.WriteLine("Não é");

        }

​

    }

}