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 throws it on the floor
Hypothesis: Because PersonX wanted to make the water balloon pop
Update: PersonX thought it was a regular ball.
Example Output: weakener

Example Input: Premise: PersonX gets tired
Hypothesis: PersonX is seen as sluggish
Update: PersonX moves very slowly.
Example Output: strengthener

Example Input: Premise: PersonX puts PersonY's hands up
Hypothesis: Before, PersonX needed to be friend with Y
Update: PersonY is happy to interact with PersonX.
Example Output:
strengthener