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 is best friends
Hypothesis: PersonX then smiles
Update: PersonX's friend hit them.
Example Output: weakener

Example Input: Premise: PersonX touches PersonY on the shoulder
Hypothesis: As a result, PersonX feels gregarious
Update: PersonX wants to fight PersonY.
Example Output: weakener

Example Input: Premise: PersonX makes PersonY's friends laugh
Hypothesis: As a result, PersonX wants to impress Y's friends
Update: Person X is exchanging phone numbers.
Example Output:
strengthener