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 spends hours
Hypothesis: PersonX then falls asleep
Update: PersonX just spent hours in bed.
Example Output: weakener

Example Input: Premise: PersonX pulls a prank on PersonY
Hypothesis: Because PersonX wanted to have fun
Update: PersonX wanted revenge on PersonY for their prank on them.
Example Output: weakener

Example Input: Premise: PersonX presents PersonY picture
Hypothesis: PersonX is seen as indifferent
Update: PersonX has a vacant expression
Example Output:
strengthener