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 boat is illuminated at night.
Hypothesis: A boat is using the lights to see at night.
Update: There is a tug boat pulling up to the boat with men shining lights in to the boat.
Example Output: weakener

Example Input: Premise: A smiling man with short brown hair in a black shirt with an open orange shoe box.
Hypothesis: The man is buying new shoes.
Update: The shoe box holds a big pile of receipts.
Example Output: weakener

Example Input: Premise: A group of people jump in the air while playing music in the street.
Hypothesis: A group of people jump as they hear the local band play their favorite song.
Update: The song was on the Billboard Top 10 for months.
Example Output:
strengthener