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: Man walking little girl with backpack across street.
Hypothesis: The man is the girl's father.
Update: The man kisses the girl on the cheek.
Example Output: strengthener

Example Input: Premise: A smiling man with short brown hair in a black shirt with an open orange shoe box.
Hypothesis: The man is buying new shoes.
Update: The shoe box holds a big pile of receipts.
Example Output: weakener

Example Input: Premise: 2 female babies eating chips.
Hypothesis: 2 female babies are enjoying their first meal of the day.
Update: The two female babies are given chips while they wait for their lunch.
Example Output:
weakener