In this task, you are given a premise, a hypothesis, and an update. The premise sentence describes a real-world situation and is always assumed to be true. The hypothesis sentence describes an assumption or inference that you might make about that situation having read the premise. The update provides additional information about the situation that might weaken or strengthen the hypothesis. A weakener is a statement that weakens the hypothesis, that is, it makes you much less likely to believe the hypothesis is true. A strengthener is a statement that strengthens the hypothesis, that is, it makes you much more likely to believe the hypothesis is true. Your task is to answer with 'strengthener' or 'weakener' if the update strengthens or weakens the hypothesis, respectively.

Example Input: Premise: What a pretty red convertible was in the parade that night.
Hypothesis: The convertible top was down.
Update: It was a balmy, starry night.
Example Output: strengthener

Example Input: Premise: A lady pushes a stroller, behind a child, riding a tricycle, while another child walks along side.
Hypothesis: A lady is pushing a stroller with a baby inside
Update: As a squirrel runs up a tree, barking is heard from inside the stroller.
Example Output: weakener

Example Input: Premise: One father-aged man and one young girl are swimming in a green pool of water.
Hypothesis: Daughter and father swimming in green water.
Update: The young girl hugs the man as they swim in the water.
Example Output:
strengthener