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 with a conductors hat sticks his head out the window and leans on the windowsill of the train.
Hypothesis: A man sticks his head out of the window.
Update: The man's hair blows in the wind.

Ex Output:
strengthener


Ex Input:
Premise: A man in a hat is sitting with his hands folded.
Hypothesis: The man is patiently waiting for someone.
Update: The man is pacing back and forth.

Ex Output:
weakener


Ex Input:
Premise: A biker is doing an aerial trick on his bike.
Hypothesis: The biker performs a scary trick on his bike.
Update: The biker remains seated during the trick.

Ex Output:

weakener