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: Young women practicing marshal arts in a gym.
Hypothesis: A group of women doing Tai Chi at the gym.
Update: The women are part of a class.
Example Output: strengthener

Example Input: Premise: A man in black is talking into the microphone.
Hypothesis: The man is a singer.
Update: The man is in an announcing booth.
Example Output: weakener

Example Input: Premise: A woman is leading an exercise group on the seashore.
Hypothesis: A group of people are on vacation
Update: They are at a resort.
Example Output:
strengthener