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 tracks PersonY
Hypothesis: Before, PersonX needed find out PersonY's habits.
Update: X hired a PI.
Example Output: strengthener

Example Input: Premise: PersonX takes PersonX's glasses
Hypothesis: As a result, PersonX feels content
Update: PersonX can see better with the glasses.
Example Output: strengthener

Example Input: Premise: PersonX keeps it safe
Hypothesis: As a result, PersonX feels careful
Update: The item is in pristine condition.
Example Output:
strengthener