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 racks PersonX's brain
Hypothesis: As a result, PersonX feels lethargic
Update: PersonX exerts a lot of mental energy.
Example Output: weakener

Example Input: Premise: PersonX quenches PersonX's thirst
Hypothesis: As a result, PersonX wants to belch
Update: PersonX opens their mouth, as they drank way too fast.
Example Output: strengthener

Example Input: Premise: PersonX boards a plane
Hypothesis: Because PersonX wanted to go abroad
Update: PersonX has a fanny pack
Example Output:
strengthener