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: People in blue t-shirts stand in the grass.
Hypothesis: People in blue t-shirts stand around talking about their lives.
Update: They are looking at pictures of one another's vacations on their smartphones.
Example Output: strengthener

Example Input: Premise: A boy in the woods.
Hypothesis: There is a boy headed to the woods.
Update: A police dispatcher says 'I see the guy walking towards the dark trees area'
Example Output: strengthener

Example Input: Premise: A group of people is setting up plastic poles in the middle of a city.
Hypothesis: It is a rainy day.
Update: The people are getting tan.
Example Output:
weakener