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 boy doing a trick in the air on his bicycle
Hypothesis: A boy doing a trick is laughing.
Update: The boy is straight-faced.
Example Output: weakener

Example Input: Premise: Many people sitting in chairs at a presentation.
Hypothesis: The people are very bored
Update: Everyone is looking eagerly at the presenter.
Example Output: weakener

Example Input: Premise: A lady in black pants, white t-shirt with red writing across breast, doing a stretch exercise on top of a concrete sphere with a 18th century building surrounding the sphere.
Hypothesis: A lady does stretches on a work of art.
Update: This is the worst exercise ball she has ever used.
Example Output:
weakener