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: Girl wearing a hat and holding her bike talks to her friend.
Hypothesis: Girl holding her bike is talking to her friend with black hair.
Update: The girl's hair is dark.
Example Output: strengthener

Example Input: Premise: A man preparing his net for fishing.
Hypothesis: A young man fixes holes in a net before fishing for bait fish.
Update: The man's face is wrinkled.
Example Output: weakener

Example Input: Premise: a brown dog is jumping up at a woman in a black coat.
Hypothesis: A woman is playing with her dog.
Update: The woman is holding a leash connecting to the dog.
Example Output:
strengthener