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: Four dark-haired girls walk the hall toward a bank of lockers.
Hypothesis: Girls are at the gym.
Update: They are between classes.
Example Output: weakener

Example Input: Premise: A young man wearing a red bandanna at an event.
Hypothesis: The event is outdoors.
Update: The bandanna kept the young man dry when the rain started in the middle of the concert.
Example Output: strengthener

Example Input: Premise: Two men hold an oversized check being presented to a children's aids charity.
Hypothesis: two CEO's give a giant check to charity
Update: The event organizers hand off the check.
Example Output:
weakener