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.
--------
Question: 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.

Answer: strengthener


Question: Premise: Men walking on the scaffolding of a building.
Hypothesis: A male construction worker making his way toward a damaged piece of scaffolding at the edge of a building.
Update: The man is fixing up the washroom

Answer: weakener


Question: Premise: two guys playing a game of baseball.
Hypothesis: Two guys are playing baseball at night.
Update: There are lights needed to be able to see the ball.

Answer:
strengthener