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: Two dogs on leashes straining toward each other while their owners walk away from each other.
Hypothesis: The dogs hate eachother.
Update: The two male dogs are very aggressive towards each other.
Example Output: strengthener

Example Input: Premise: Little boy in black jacket, kicking leaves.
Hypothesis: A child is happily playing in the leaves.
Update: His face is sullen.
Example Output: weakener

Example Input: Premise: A little boy in a yellow shirt and a blue hat sits on the dock.
Hypothesis: the boy looks at the water
Update: He is getting ready to dive in.
Example Output:
strengthener