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.

[EX Q]: Premise: Cheerleaders are performing on a football field.
Hypothesis: Cheerleaders are performing on AstroTurf.
Update: Two of the cheerleaders have rug burns on their knees from the AstroTurf.
[EX A]: strengthener

[EX Q]: Premise: This man is wearing a red helmet and flip-flops and driving a Spyder.
Hypothesis: A man driving a car to a dealer to have it tuned up.
Update: The man's Spyder glides down the road.
[EX A]: weakener

[EX Q]: Premise: A man poses in front of a large rock formation.
Hypothesis: A man stands in front of Devil's Tower.
Update: The man is in Yosemite National Park.
[EX A]:
weakener