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 lady pushes a stroller, behind a child, riding a tricycle, while another child walks along side.
Hypothesis: A lady is pushing a stroller with a baby inside
Update: As a squirrel runs up a tree, barking is heard from inside the stroller.
Example Output: weakener

Example Input: Premise: An old man juggling fire outside a street corner.
Hypothesis: A street performer is juggling.
Update: A man lost his balance and is fumbling items.
Example Output: weakener

Example Input: Premise: A man has removed his shoes while sitting on a bench in the park and watching the fountain.
Hypothesis: The man is barefoot.
Update: The man's skin can be seen on his feet.
Example Output:
strengthener