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 eats burgers
Hypothesis: PersonX then mouth gets dirty
Update: X brushes his teeth.
Example Output: strengthener

Example Input: Premise: PersonX finishes PersonY's hike
Hypothesis: As a result, PersonX wants to run
Update: PersonX is stretching their legs
Example Output: strengthener

Example Input: Premise: PersonX wins the tickets
Hypothesis: As a result, PersonX wants to buy an outfit for the show
Update: They are going to a concert
Example Output:
strengthener