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 is helping another man after a fall on the street.
Hypothesis: The man is his brother.
Update: The men look almost identical to each other.
Example Output: strengthener

Example Input: Premise: The Irish Setter is retrieving a flashlight from the pond.
Hypothesis: A dog is fetching something for its owner.
Update: Behind the dog are a few police cars with their lights on.
Example Output: weakener

Example Input: Premise: The female artist was painting a landscape picture in the outdoors using a variety of colors.
Hypothesis: The female is wearing a smock.
Update: The woman is a professional artist.
Example Output:
strengthener