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 dog jumps into the pond.
Hypothesis: A dog jumps to get his ball.
Update: The dog likes to swim
Example Output: weakener

Example Input: Premise: A lady in a sunhat sitting and reading a book by a body of water.
Hypothesis: A lady is sitting and reading.
Update: The lady has several library cards.
Example Output: strengthener

Example Input: Premise: People going for a long walk to the mountains.
Hypothesis: The people are walking in a big group.
Update: The guests are enjoying a tour of the mountains
Example Output:
strengthener