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 person in a blue tank top climbing a rock.
Hypothesis: A woman is rock climbing.
Update: The person has painted fingernails.
Example Output: strengthener

Example Input: Premise: A brown dog is playing with a white fluffy stuffed animal.
Hypothesis: A dog is playing with a stuffed bear.
Update: The stuffed animal has long ears.
Example Output: weakener

Example Input: Premise: The tennis player wears a headband to protect his eyes from sweat.
Hypothesis: The tennis player uses his headband to improve his game
Update: The headband gets in the way of the player sometimes.
Example Output:
weakener