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 introduces PersonY
Hypothesis: Before, PersonX needed to know PersonY's name
Update: PersonX is introducing PersonY from memory.
Example Output: strengthener

Example Input: Premise: PersonX goes to the local animal shelter
Hypothesis: Before, PersonX needed to walk in
Update: There in a new drive through feature that makes the shelter popular.
Example Output: weakener

Example Input: Premise: PersonX improves PersonX's lot
Hypothesis: PersonX then personX's lot is made better
Update: PersonX loses everything in a tragedy.
Example Output:
weakener