TASK DEFINITION: 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.
PROBLEM: Premise: PersonX joins PersonX's friends
Hypothesis: PersonX then is smiling
Update: PersonX walked into a surprise birthday party

SOLUTION: strengthener

PROBLEM: Premise: PersonX sets a trap
Hypothesis: As a result, PersonX feels aggressive
Update: PersonX is a serial murderer

SOLUTION: strengthener

PROBLEM: Premise: PersonX passes through PersonY's hands
Hypothesis: Before, PersonX needed to be sneaky
Update: PersonY is very vigilant

SOLUTION:
weakener