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 sees PersonZ's friend PersonY
Hypothesis: As a result, PersonX wants to have a good time
Update: They're at a house party
Example Output: strengthener

Example Input: Premise: PersonX mows my lawn
Hypothesis: As a result, PersonX feels ambitious
Update: The lawn is vast and it takes hours.
Example Output: weakener

Example Input: Premise: PersonX uses the computer
Hypothesis: Before, PersonX needed to turn it on
Update: PersonX searched several minutes for the power button.
Example Output:
strengthener