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 Q]: Premise: A black man stares angrily on the street.
Hypothesis: A black man on the street stares angrily after being robbed.
Update: There's someone yelling at a child across the street.
[EX A]: weakener

[EX Q]: Premise: The sky appears clear.
Hypothesis: The sky looked very clear at night.
Update: Many stars are visible.
[EX A]: strengthener

[EX Q]: Premise: Two dogs running in a field.
Hypothesis: Two black dogs are running in a field.
Update: They look like shadows on the grass.
[EX A]:
strengthener