using System;

using System.Collections.Generic;

using System.Linq;

using System.Collections.Immutable;

public class Programi

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        List<int> list = [0, 1, 2, 3];

        ImmutableList<int> newlist = [.. from item in list where item > 0 select item];

        Console.WriteLine( string.Join(",", newlist) );

    }

}