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.

Ex Input:
Premise: man in yellow shirt with USA on it sits on chair next to door
Hypothesis: A man near the door is waiting for a friend.
Update: The man is watching the door for hoodlums.

Ex Output:
weakener


Ex Input:
Premise: Customers shopping at an outdoor fruit market.
Hypothesis: People are shopping in a farmer's market.
Update: there are lots of vendors selling produce.

Ex Output:
strengthener


Ex Input:
Premise: Teenagers working in a chemistry class.
Hypothesis: Teenagers are in a classroom.
Update: The teenagers are wearing goggles.

Ex Output:

strengthener