Imagine that you have a stack (called stack) that is initially empty. You then perform the following sequence of operations: stack.push(1) stack.push(2) stack.pop() stack.push(3) stack.push(4) stack.push(stack.pop()) What are the contents of stack after all of these operations are complete? In order for your answer to be counted as correct by the autograder, you must adhere to the following specifications: - You may not include any whitespace in your answer. - You must write the elements using Python list syntax (i.e., enclosed in square brackets and separated by commas) such that the rightmost element would be the next element to be popped