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.

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.
strengthener

Premise: The basketball player wearing the white outfit and orange sneakers is doing a lay up.
Hypothesis: Kobe Bryant, wearing a white outfit and orange sneakers, is doing a lay up in front of a crowd.
Update: The crowd is silent.
weakener

Premise: A boy with a blue shirt travels on a skateboard past a Blockbuster video store on the corner.
Hypothesis: The boy rides away on his skateboard after returning some videotapes.
Update: The boy is picked up by his mom

weakener