using System;

using LanguageExt;

using static LanguageExt.Prelude;

public class Program

{

    public static void Main()

    {

        string x = "Alberto";

        var personaOption = Optional(x);

        var conApellidoOption = personaOption

                                 .Map(x => $"{x} Fernández")

                                 .Bind(x => x.Contains("Juán") ? None : Some(x));

        var nombreYApellido = conApellidoOption.Match

        (

            x => x,

            () => "Israel Silvestre"

        );

        Console.WriteLine(nombreYApellido);

    }l

}