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: Cheerleaders perform.
Hypothesis: The Cheerleaders are shaking their pom poms
Update: The cheerleaders did a gymnastics routine.
Example Output: weakener

Example Input: Premise: A group of girls sit back to back.
Hypothesis: A group of girls are sitting on the road.
Update: The girls are refugees.
Example Output: strengthener

Example Input: Premise: Workers in reflective clothing with shovels on a train track.
Hypothesis: Workers are working at night.
Update: Crickets are chirping loudly in the woods
Example Output:
strengthener