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.

[Q]: Premise: A man is performing acrobatics over a group of people kneeling on the ground.
Hypothesis: The acrobat is doing a hard trick.
Update: The acrobat is concentrating very intently.
[A]: strengthener


[Q]: Premise: A man on a scaffold paints a wall with a paint roller.
Hypothesis: A man is painting a picture.
Update: He looks thoughtfully at his work then reaches for another roller in a tray with a different color of paint.
[A]: strengthener


[Q]: Premise: A woman with a white shirt is standing near a couple in front of a store called "Concepts."
Hypothesis: The woman is going to shop at the store.
Update: The woman is looking in the window
[A]:
strengthener