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.

Q: Premise: PersonX visits mexico
Hypothesis: PersonX then flies back home
Update: PersonX bought plane tickets there.

A: strengthener
****
Q: Premise: PersonX buys a cake
Hypothesis: Before, PersonX needed to go to shop
Update: PersonX sits in front of a computer

A: weakener
****
Q: Premise: PersonX meets PersonY in the street
Hypothesis: Before, PersonX needed to leave their home and head to the street
Update: PersonX ensured they had their keys as they walked

A:
strengthener
****