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.

[Q]: Premise: Many people are walking or standing on a busy city sidewalk.
Hypothesis: An angry mob discussing how to storm a building.
Update: They are outside a business that was running a scam and want their money back.
[A]: strengthener


[Q]: Premise: A man scuba diving while holding a large flashlight.
Hypothesis: A man is looking at fish.
Update: The man is near a reef.
[A]: strengthener


[Q]: Premise: A man walking down the street with his hands in his pocket, and an elderly woman stands near a staircase with her hand on her purse.
Hypothesis: A man is happily walking down the street.
Update: The man is whistling while he walks.
[A]:
strengthener