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, that is, it makes you much less likely to believe the hypothesis is true. A strengthener is a statement that strengthens the hypothesis, that is, it makes you much more likely to believe the hypothesis is true. Your task is to answer with 'strengthener' or 'weakener' if the update strengthens or weakens the hypothesis, respectively.

Example Input: Premise: Dancers a standing on a sidewalk.
Hypothesis: Some dancers are waiting for the bus.
Update: The dancers are headed on a tour.
Example Output: strengthener

Example Input: Premise: Two men, both wearing black outfits with red stripes are engaging in some sort of fighting style using canes.
Hypothesis: They are in a competition
Update: People walk their dogs by them in the park.
Example Output: weakener

Example Input: Premise: A boy wearing jeans, standing on rocks in a river and throwing a stone.
Hypothesis: A boy with no shirt on throws rocks.
Update: There is a pile of stones near the boy's feet.
Example Output:
strengthener