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 pats PersonY on the head
Hypothesis: PersonX then congratulates
Update: PersonY is very young and PersonX is nurturing.
Example Output: strengthener

Example Input: Premise: PersonX gets a picture
Hypothesis: Because PersonX wanted a picture
Update: X's daughter painted it for him for Father's Day.
Example Output: weakener

Example Input: Premise: PersonX is always so happy
Hypothesis: As a result, PersonX wants help others be happy by volunteering
Update: PersonX spends many afternoons visiting the hosital children's ward
Example Output:
strengthener