Create a Node() using the data argument. Set the created node to the top node. Increase by one the size of the stack.

Here's the code to create a `Node()` using the `data` argument, set the created node to the top node, and increase by one the size of the stack: ``` class Stack: def __init__(self): # Initially there won't be any node at the top of the stack self.top = None # Initially there will be zero elements in the stack self.size = 0 def push(self, data): # Create a new node with the given data new_node = Node(data) # Set the new node as the top node new_node.next = self.top self.top = new_node # Increase the size of the stack by one self.size += 1 ``` This creates a new node with the given data, sets it as the top node, and increases the size of the stack by one.