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 very happy baby in a yellow shirt swinging on swing.
Hypothesis: The child is being pushed on the swing by their mother.
Update: A babysitter is pushing the baby
Example Output: weakener

Example Input: Premise: Two men play basketball.
Hypothesis: Two men are competing for the last spot on the basketball team.
Update: Two men are competing to become the final teammate on the basketball team this season.
Example Output: strengthener

Example Input: Premise: A white man with a mustache is playing guitar.
Hypothesis: The man is playing in a concert.
Update: There is a large crowd watching the man.
Example Output:
strengthener