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 knocks PersonX down with a feather
Hypothesis: Because PersonX wanted to be surprised
Update: PersonX has an angry look on their face.
Example Output: weakener

Example Input: Premise: PersonX gives tom
Hypothesis: Before, PersonX needed to have something to give
Update: X passes along his knowledge.
Example Output: strengthener

Example Input: Premise: PersonX loves PersonY still
Hypothesis: Because PersonX wanted to stay with person
Update: They cheated on them
Example Output:
weakener