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 defends PersonY's rights
Hypothesis: PersonX then defends
Update: PersonX works on their next trial.
Example Output: strengthener

Example Input: Premise: PersonX warns PersonY of the danger
Hypothesis: Before, PersonX needed to be in the meteorological department
Update: X noted the increasing wind speed.
Example Output: strengthener

Example Input: Premise: PersonX changes PersonX's course
Hypothesis: Before, PersonX needed to know about the course
Update: PersonX is following the birthday balloon.
Example Output:
weakener