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 a new bike
Hypothesis: As a result, PersonX wants to get a helmet
Update: PersonX previous helmet is broken
Example Output: strengthener

Example Input: Premise: PersonX has just moved into a new house
Hypothesis: Before, PersonX needed to sell old house
Update: PersonX has never lived alone before
Example Output: weakener

Example Input: Premise: PersonX bends PersonX's elbow
Hypothesis: PersonX then gets an injury
Update: PersonX bends it the wrong way.
Example Output:
strengthener