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 woman is sitting on a man's lap in a chair.
Hypothesis: The man is in love with the woman sitting on his lap.
Update: The woman is the man's wife.
Example Output: strengthener

Example Input: Premise: One man is singing into a microphone and another musician is playing the guitar while standing next to each other.
Hypothesis: The man played the guitar very well.
Update: The other members of the band stop playing and let the guitar player take over as the crowd cheers.
Example Output: strengthener

Example Input: Premise: A dog jumping over an obstacle hurdle.
Hypothesis: The dog is in the process of its show-winning course.
Update: The dog has a number on it.
Example Output:
strengthener