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: A man is helping another man after a fall on the street.
Hypothesis: The man is his brother.
Update: The men look almost identical to each other.

Ex Output:
strengthener


Ex Input:
Premise: This is an airplane full of people.
Hypothesis: The people are all refugees.
Update: The people are wearing Disney attire.

Ex Output:
weakener


Ex Input:
Premise: A man in a black jacket is admiring the merchandise from a street vendor who is wearing a brown jacket.
Hypothesis: A man is looking to purchase a knock off purse from a street vendor.
Update: The man was directed to this street vendor from another vendor.

Ex Output:

strengthener