private static void PopLastElement(MyStackWithLinkedList obj)
        {
            int number;

            number = obj.Pop();
            if (number != int.MinValue)
            {
                Console.WriteLine("Popped {0}", number);
            }
        }
        private static void PrintTheLastElement(MyStackWithLinkedList obj)
        {
            int number;

            number = obj.Peek();
            if (number != int.MinValue)
            {
                Console.WriteLine("Last element {0}", number);
            }
        }
        private static void Main()
        {
            var obj = new MyStackWithLinkedList();

            obj.Push(8);
            PopLastElement(obj);
            PopLastElement(obj);
            PrintTheLastElement(obj);
            obj.Push(10);
            obj.Push(9);
            PrintTheLastElement(obj);
        }