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 increases PersonY's knowledge
Hypothesis: Because PersonX wanted to educate
Update: PersonX was PersonY's supervisor.
Example Output: weakener

Example Input: Premise: PersonX puts the book
Hypothesis: PersonX then cannot read it from where it is
Update: The book is closed and on a shelf.
Example Output: strengthener

Example Input: Premise: PersonX feels good
Hypothesis: As a result, PersonX feels open
Update: PersonX is playing sports
Example Output:
weakener