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 boy doing a trick in the air on his bicycle
Hypothesis: A boy doing a trick is laughing.
Update: The boy is straight-faced.
Example Output: weakener

Example Input: Premise: A man, woman, child sitting on benches waiting for the bus.
Hypothesis: The people are sitting outside.
Update: The wind cuts through you like a knife.
Example Output: strengthener

Example Input: Premise: A man is crossing a mountain pass on a metal bridge.
Hypothesis: A man is crossing a bridge to get back home.
Update: The man has a parachute on his back and stands up on the bridge
Example Output:
weakener