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.

Q: Premise: Little boy in black jacket, kicking leaves.
Hypothesis: A child is happily playing in the leaves.
Update: His face is sullen.

A: weakener
****
Q: Premise: One man is sleeping, the other is jumping on his bed, both are wearing white and look to be on Indian descent.
Hypothesis: The men are brothers who share a bedroom.
Update: The men are in a house owned by people they're both related to.

A: strengthener
****
Q: Premise: Four men are rollerskating in a line, with the last three holding onto the hips of the man ahead of them.
Hypothesis: Some people do trick rollerskating for a contest.
Update: The four skaters are motivated by the prize money.

A:
strengthener
****