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.

Example Input: Premise: A boy in a black shirt punches a yellow punching bag while a boy in a blue sweatshirt holds the bag.
Hypothesis: Two boys take turns using a punching bag.
Update: They are both training.
Example Output: strengthener

Example Input: 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.
Example Output: strengthener

Example Input: Premise: Three people playing in a pool next to a home.
Hypothesis: three people are playing basketball in a pool
Update: a small boy catches the ball with one hand.
Example Output:
weakener