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.

Premise: A blond little boy is standing by a fence.
Hypothesis: The boy is waiting for his friends to come over.
Update: he is waving to boys walking towards him.
strengthener

Premise: A band playing on stage, with one man on keyboards and the other playing a red guitar.
Hypothesis: A band is playing to a sold out crowd.
Update: The people are screaming encore.
strengthener

Premise: A dog running through the snow.
Hypothesis: The labrador is retrieving the stick.
Update: The dog's owner plays fetch with the dog.

strengthener