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 smiling man with short brown hair in a black shirt with an open orange shoe box.
Hypothesis: The man is buying new shoes.
Update: The shoe box holds a big pile of receipts.
Example Output: weakener

Example Input: Premise: A man in a tank top looks at a woman near a water sculpture.
Hypothesis: A man thinks a woman is pretty.
Update: The man is smiling.
Example Output: strengthener

Example Input: Premise: Sled dogs run through the snow with their tongues hanging out.
Hypothesis: Two dogs pull a sled in a race.
Update: Spectators are watching the dogs.
Example Output:
strengthener