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: The Irish Setter is retrieving a flashlight from the pond.
Hypothesis: A dog is fetching something for its owner.
Update: Behind the dog are a few police cars with their lights on.
Example Output: weakener

Example Input: Premise: A man on a scaffold paints a wall with a paint roller.
Hypothesis: A man is painting a picture.
Update: He looks thoughtfully at his work then reaches for another roller in a tray with a different color of paint.
Example Output: strengthener

Example Input: Premise: A person in a blue tank top climbing a rock.
Hypothesis: A woman is rock climbing.
Update: The person has painted fingernails.
Example Output:
strengthener