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 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 gets money back
Hypothesis: As a result, PersonX wants to buy other things
Update: PersonX goes to the mall.
Example Output: strengthener

Example Input: Premise: PersonX forces upon PersonY
Hypothesis: As a result, PersonX wants to defeat PersonY
Update: They are in a mixed martial arts class.
Example Output:
strengthener