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 borrows the car
Hypothesis: PersonX is seen as thankful
Update: X crashes the car.
Example Output: weakener

Example Input: Premise: PersonX walks everywhere
Hypothesis: As a result, PersonX wants to save money on gas
Update: They spend too much on gas
Example Output: weakener

Example Input: Premise: PersonX takes the book
Hypothesis: Because PersonX wanted to be a thief
Update: The book is a university textbook
Example Output:
strengthener