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 moves toward the door
Hypothesis: Before, PersonX needed to turn around
Update: PersonX was heading out of the house.
Example Output: weakener

Example Input: Premise: PersonX eats pasta
Hypothesis: PersonX then gets sauce on face
Update: PersonX is a toddler
Example Output:
strengthener