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 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 young woman and a young man sitting in the grass
Hypothesis: They are a couple
Update: The woman and the man maintain a distance between them and never touch.
Example Output: weakener

Example Input: Premise: Two police officers and one man in civilian clothes are standing on a street.
Hypothesis: The police officers are trying to stop a riot.
Update: The police officers are about to walk into their precinct building.
Example Output:
weakener