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: Girl walking her horse across the street.
Hypothesis: The horse has a saddle on his back.
Update: The girl is taking the horse to a barn for the night
Example Output: weakener

Example Input: Premise: A surfer rides his surfboard at the start of a wave.
Hypothesis: There are several people surfing on big waves.
Update: The surfer worries that nobody will see him fall.
Example Output: weakener

Example Input: Premise: Two girls running in tank tops and shorts across a court.
Hypothesis: Girls chasing each other during recess.
Update: The girls are in elementary school.
Example Output:
strengthener