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.

Premise: PersonX celebrates PersonY 's day
Hypothesis: As a result, PersonX feels selfless
Update: PersonX smashes the cake into PersonY's face.
weakener

Premise: PersonX learns how to play the violin
Hypothesis: Because PersonX wanted to be a musician.
Update: PersonX wants to join the orchestra.
strengthener

Premise: PersonX gets PersonX's keys
Hypothesis: Before, PersonX needed to know what the keys look like
Update: PersonY tells PersonX the keys are on a blue key ring.

strengthener