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 knits PersonX's brows
Hypothesis: Because PersonX wanted to understand something
Update: PersonX is looking at a calculus book.
Example Output: strengthener

Example Input: Premise: PersonX drives to the lake
Hypothesis: PersonX is seen as contented
Update: PersonX gets trapped in their car.
Example Output: weakener

Example Input: Premise: PersonX skateboards with PersonX's friends
Hypothesis: As a result, PersonX feels energetic
Update: PersonX is injured
Example Output:
weakener