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 plays basketball every day
Hypothesis: PersonX is seen as happy
Update: Person X is the best player on the team and screams out loud when he slam dunks.
Example Output: strengthener

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 prevents PersonY's escape
Hypothesis: Before, PersonX needed to put up high walls
Update: PersonX is athletic
Example Output:
strengthener