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 eats bacon
Hypothesis: Before, PersonX needed to check fridge to see if he has any bacon
Update: PersonX is sitting at a table in a diner.
Example Output: weakener

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 hears a knock at the door
Hypothesis: As a result, PersonX wants to get their gun
Update: PersonX thinks there are robbers at the door
Example Output:
strengthener