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.

Ex 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.

Ex Output:
strengthener


Ex Input:
Premise: A boy wearing blue shorts is doing a back flip in the air under a tree.
Hypothesis: A boy is doing back flips outdoors
Update: The tree is in the local park

Ex Output:
strengthener


Ex Input:
Premise: A man jogging on the sidewalk while listening to music.
Hypothesis: A man jogging on the sidewalk while listening to music is doing it for his health.
Update: The man is chasing his dog who ran away.

Ex Output:

weakener