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 helps PersonY learn
Hypothesis: Before, PersonX needed have knowledge
Update: PersonX is a certified teacher.
Example Output: strengthener

Example Input: Premise: PersonX has a smile on PersonY's face
Hypothesis: PersonX then is happy
Update: Person X mumbles 'I hate Person Y'
Example Output: weakener

Example Input: Premise: PersonX is really dirty
Hypothesis: As a result, PersonX wants to take a shower
Update: PersonX was walking home and got caked with mud when a car raced through a puddle and spattered them.
Example Output:
strengthener