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 man is moving a gate that impedes the progress of an oncoming train.
Hypothesis: The railroad worker is completing his last task for the day.
Update: The worker is very tired.

Answer: strengthener


Question: Premise: An African American man smiling.
Hypothesis: The man is showing his teeth to a doctor.
Update: The man is knocking on a door

Answer: weakener


Question: Premise: A woman lying under an umbrella outside while two young boys run around her.
Hypothesis: A women on vacation with her family enjoying the weather.
Update: The woman is smiling.

Answer:
strengthener