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. It makes you much less likely to believe the hypothesis is true. A strengthener is a statement that strengthens the hypothesis. It makes you much more likely to believe the hypothesis is true. Your task is to output 'strengthener' or 'weakener' if the update strengths or weakens the hypothesis, respectively.

Example Input: Premise: PersonX buys an air purifier
Hypothesis: Because PersonX wanted to shopping
Update: PersonX has trouble breathing at home.
Example Output: weakener

Example Input: Premise: PersonX climbs the stairs
Hypothesis: Because PersonX wanted to get to the top
Update: PersonX is afraid of heights.
Example Output: weakener

Example Input: Premise: PersonX pushes PersonY's chair
Hypothesis: As a result, PersonX feels unfriendly
Update: PersonY is sitting in the chair at their desk at work.
Example Output:
strengthener