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.
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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: A man running across the grass towards a woman.
Hypothesis: A man is running to his wife.
Update: The man has a police uniform on

Answer: weakener


Question: Premise: A group of people in red shirts and white pants are walking single file down a dirt path in the middle of a field.
Hypothesis: People are walking on a hike.
Update: There was a sign with a map up ahead.

Answer:
strengthener