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 moves back
Hypothesis: PersonX then personX smiles
Update: PersonX always loved their hometown.
Example Output: strengthener

Example Input: Premise: PersonX bends PersonX's elbow
Hypothesis: Before, PersonX needed to feel pain
Update: PersonX plays tennis.
Example Output: weakener

Example Input: Premise: PersonX recently visited
Hypothesis: PersonX then leaves
Update: PersonX purchases a home in the place PersonX visited.
Example Output:
weakener