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: Man walking little girl with backpack across street.
Hypothesis: The man is the girl's father.
Update: The man kisses the girl on the cheek.

A: strengthener
****
Q: Premise: An enthusiastic young man runs with an exercise ball as he's being chased.
Hypothesis: A man and his friend is playing catch.
Update: The man throws the ball back to his friend.

A: strengthener
****
Q: Premise: A person on a BMX bike riding off a jump.
Hypothesis: A BMX biker performs a trick.
Update: The biker's friend is recording him.

A:
strengthener
****