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 performs PersonY's tasks
Hypothesis: As a result, PersonX wants ask personY if they did a good job
Update: PersonY is dead
Example Output: weakener

Example Input: Premise: PersonX speeds past PersonY
Hypothesis: PersonX then finds a place to hide
Update: PersonX's heart is racing in their chest.
Example Output:
strengthener