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 on a motorcycle is towing a bicyclist on his bicycle behind him.
Hypothesis: A man on a red motorcycle is towing a bicyclist on a blue bicycle.
Update: The bicyclist's black helmet matches the color of his bike.

Ex Output:
weakener


Ex Input:
Premise: A group of people is sitting together at a long table.
Hypothesis: A group of people that are friendly with one another are sitting together at the table.
Update: The group is laughing and people have their arms around each other.

Ex Output:
strengthener


Ex Input:
Premise: A man in a pink shirt stands next to a stack of hats.
Hypothesis: A man is standing next to the hat display in the store.
Update: The hats have price tags on them.

Ex Output:

strengthener