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 drives to the gas station
Hypothesis: Before, PersonX needed to check the fuel level
Update: PersonX has a grocery list
Example Output: weakener

Example Input: Premise: PersonX speaks with PersonY
Hypothesis: Before, PersonX needed locate y
Update: PersonX walked to PersonY's house.
Example Output: strengthener

Example Input: Premise: PersonX eats less
Hypothesis: As a result, PersonX wants to weigh themselves
Update: PersonX's goal is to lose fifty pounds.
Example Output:
strengthener