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 men and a woman running together for a competition.
Hypothesis: The men and woman are teaming up.
Update: They are on a relay team
Example Output: strengthener

Example Input: Premise: A boy who is next to a river smiles tentatively at the camera.
Hypothesis: a boy is smiling at the camera before he jumps in the river
Update: The boy is wearing a winter jacket.
Example Output: weakener

Example Input: Premise: a black and white dog jumping into a pool with a lot of tennis balls in it.
Hypothesis: The dog is going after the tennis ball.
Update: The dog splashes around.
Example Output:
weakener