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 young girl does a handstand on a bed with blue sheets.
Hypothesis: A girl is practicing gymnastics on her bed.
Update: The girl has a headstand video up on YouTube that she is copying
Example Output: strengthener

Example Input: Premise: Four dark-haired girls walk the hall toward a bank of lockers.
Hypothesis: Girls are at the gym.
Update: They are between classes.
Example Output: weakener

Example Input: Premise: A man in a tie-dyed shirt and jeans is sitting on a bench with a dog and a guitar on his lap, as well as a harmonica near his mouth.
Hypothesis: The street performer takes a break.
Update: He is singing and strumming on the guitar.
Example Output:
weakener