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: Young punk rock guitarist, wearing a red lined jacket with a badge, is in front of foggy blue and purple lighting.
Hypothesis: The new popular guitarist stands in front of lighting at his new show
Update: The guitarist is nervous
Example Output: strengthener

Example Input: Premise: A yellow car is creating smoke by spinning its tires.
Hypothesis: A car is being driven dangerously in the street.
Update: The driver doesn't realize he left the parking brake on before exiting the lot.
Example Output: weakener

Example Input: Premise: a boy jumps into the pool.
Hypothesis: The boy is swimming.
Update: The boy backstrokes to the other side.
Example Output:
strengthener