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

Example Input: Premise: PersonX walks PersonX's dogs
Hypothesis: PersonX then feels better for having excercised
Update: They walked only one block
Example Output: weakener

Example Input: Premise: PersonX complains to PersonX's mother
Hypothesis: As a result, PersonX feels critical
Update: PersonX is always complaining about her sister.
Example Output:
strengthener