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. It makes you much less likely to believe the hypothesis is true. A strengthener is a statement that strengthens the hypothesis. It makes you much more likely to believe the hypothesis is true. Your task is to output 'strengthener' or 'weakener' if the update strengths or weakens the hypothesis, respectively.

Example Input: Premise: PersonX starts coughing
Hypothesis: Before, PersonX needed sitting on chair
Update: They had to see the doctor
Example Output: strengthener

Example Input: Premise: PersonX wants to learn how to play the guitar
Hypothesis: Before, PersonX needed to find a guitar teacher
Update: PersonX found a great series of tutorials on YouTube.
Example Output: weakener

Example Input: Premise: PersonX drives home one night
Hypothesis: As a result, PersonX feels homesick
Update: X feels revulsion.
Example Output:
weakener