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 group of people in business casual clothes sitting on blue chairs arranged in a circle around a laptop.
Hypothesis: The people are in a circle to perform a meeting.
Update: The people are in a circle to collectively search for better jobs.
Example Output: weakener

Example Input: Premise: A flying machine with a yellow sail is landing with industrial buildings in the background.
Hypothesis: The machine is not gas-operated.
Update: The machine has a battery.
Example Output: strengthener

Example Input: Premise: A man is sitting down pulling down his red long-sleeve sweater.
Hypothesis: The man's favorite color is red.
Update: The man does not like this sweater.
Example Output:
weakener