static void Main(string[] args)
{
LinkedList <int> list = new LinkedList <int>();
Console.WriteLine($"Hello World! {list.GetSize()}");
list.Add(1, 2, 3, 4, 5, 6, 7, 8, 9);
Console.WriteLine($"Linked list now has {list.GetSize()} elements.\n{list.ToString()}");
}