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 gliding on a rope swing beside a red barn.
Hypothesis: The girl is swinging alone.
Update: The girl is calling out someone's name
Example Output: weakener

Example Input: Premise: A young girl sits on the edge of a sink.
Hypothesis: a girl poses for her mother
Update: The girl's mother is holding a camera.
Example Output: strengthener

Example Input: Premise: A boy performs a stunt on rollerblades in front of small children on scooters.
Hypothesis: They are having fun.
Update: They are laughing and smiling.
Example Output:
strengthener