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.
--------
Question: 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.

Answer: strengthener


Question: Premise: An Asian man performing on a stage.
Hypothesis: A man singing.
Update: The man performs an opera aria.

Answer: strengthener


Question: Premise: Four children do backbends in the park.
Hypothesis: Some kids are practicing gymnastics.
Update: The friends are competing to see who is the most flexible.

Answer:
weakener