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 surprises PersonX's parents
Hypothesis: Because PersonX wanted to meet his parents
Update: PersonX hasn't seen their parents in months.
Example Output: strengthener

Example Input: Premise: PersonX enjoys every minute
Hypothesis: PersonX then rests after dancing his heart out
Update: PersonX is wearing sensible shoes
Example Output: strengthener

Example Input: Premise: PersonX uses PersonY's laptop
Hypothesis: PersonX then is grateful to personY
Update: PersonX is a unthoughtful person.
Example Output:
weakener