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: A man sawing wood on a fence.
Hypothesis: It's sunny outside while a man is cutting wood.
Update: The man is wearing a visor and sunglasses.
Example Output: strengthener

Example Input: Premise: Women dressed in theme costumes dance in a circle before an outdoor crowd.
Hypothesis: Women are celebrating Halloween.
Update: It is the month of may.
Example Output: weakener

Example Input: Premise: A surfer attempts to stand on his board as water splashes up from the sides.
Hypothesis: A person is learning to surf.
Update: The nervous student is getting instruction from his surfing teacher.
Example Output:
strengthener