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.

Input: Consider Input: Premise: Two men wearing sunglasses and walking outside.
Hypothesis: The two men are siblings.
Update: The men have different parents.

Output: weakener


Input: Consider Input: Premise: A person is riding a red motorcycle around a track.
Hypothesis: people are racing dirt bikes
Update: The person is being filmed by news cameras

Output: strengthener


Input: Consider Input: Premise: An ice cream truck driver stares out the truck window.
Hypothesis: The ice cream vendor is bored at work and gazes out the window of his truck.
Update: The vendor's business has been slow lately and he's been contemplating another line of work.


Output: strengthener