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: An enthusiastic young man runs with an exercise ball as he's being chased.
Hypothesis: A man and his friend is playing catch.
Update: The man throws the ball back to his friend.
Example Output: strengthener

Example Input: Premise: Nine women in blue and purple dresses and one man wearing a purple shirt and black pants, clap while a man dressed in black dances.
Hypothesis: There is a group watching a street performance.
Update: The man in black dances underneath a street sign as people watch from the sidewalk.
Example Output: strengthener

Example Input: Premise: In the autumn, two men run in opposite directions down a path that leads over a bridge and through the woods, while two others walking a dog are stopped on the bridge.
Hypothesis: Two people with dogs are stopped on a bridge because they're tired.
Update: The dog gets a drink of water from the stream.
Example Output:
weakener