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: 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.
Example Output: strengthener

Example Input: Premise: A young boy slides down a blue slide with his eyes closed while a woman with sunglasses watches, smiling.
Hypothesis: A young boy slides down a blue slide with his eyes closed because he is scared that the woman will not catch him at the bottom.
Update: Last time he hit the ground hard.
Example Output: strengthener

Example Input: Premise: A man dressed in a blue shirt and dark colored pants sits in front of several computer monitors.
Hypothesis: A man is carrying water in his backpack.
Update: He pulls a bottle out of a nearby backpack.
Example Output:
strengthener