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 wearing blue shorts is doing a back flip in the air under a tree.
Hypothesis: A boy is doing back flips outdoors
Update: The tree is in the local park
Example Output: strengthener

Example Input: Premise: A boy standing next to a small field fire and a boy running away from it.
Hypothesis: The boy is running from the field fire to get help.
Update: The is waving his hands and yelling.
Example Output: strengthener

Example Input: Premise: An Asian man performing on a stage.
Hypothesis: A man singing.
Update: The Asian man is doing flips.
Example Output:
weakener