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 uses PersonY
Hypothesis: Before, PersonX needed a plan
Update: X had an agenda.
Example Output: strengthener

Example Input: Premise: PersonX finds a book
Hypothesis: Then, he bends over and picks the book up
Update: The book is covered in spiders
Example Output: weakener

Example Input: Premise: PersonX loses twenty pounds
Hypothesis: Before, PersonX needed to get some exercise
Update: PersonX is desperate for the nearest oasis.
Example Output:
weakener