static void Main(string[] args)
    {
        MyCustomStack <string> customStack = new MyCustomStack <string>();
        string command = Console.ReadLine();

        while (command != "END")
        {
            string[] commandSplit = command.Split(new char[] { ',', ' ' }, StringSplitOptions.RemoveEmptyEntries);
            if (commandSplit[0] == "Push")
            {
                for (int i = 1; i < commandSplit.Length; i++)
                {
                    customStack.Push(commandSplit[i]);
                }
            }
            else if (commandSplit[0] == "Pop")
            {
                customStack.Pop();
            }
            command = Console.ReadLine();
        }
        foreach (var item in customStack)
        {
            Console.WriteLine(item);
        }
    }
        public void TestStack()
        {
            var myStack = new MyCustomStack(30);

            myStack.Push(20);
            myStack.Push(34);
            myStack.Push(2);
            Assert.Equal(2, myStack.Peek());
            myStack.Pop();
            Assert.Equal(34, myStack.Peek());
            myStack.Pop();
            Assert.Equal(20, myStack.Pop());
            Assert.True(myStack.IsEmpty());
            Assert.Equal(0, myStack.Size());
            Assert.Throws <InvalidOperationException>(() =>
            {
                myStack.Pop();
            });
        }