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, that is, it makes you much less likely to believe the hypothesis is true. A strengthener is a statement that strengthens the hypothesis, that is, it makes you much more likely to believe the hypothesis is true. Your task is to answer with 'strengthener' or 'weakener' if the update strengthens or weakens the hypothesis, respectively.

Example Input: Premise: A police officer is monitoring a by stander while guarding a building.
Hypothesis: The police officer is a man.
Update: The officer looks stern.
Example Output: strengthener

Example Input: Premise: Two people are on top of the bed of a truck.
Hypothesis: Two guys sit in the bed while the car is in motion.
Update: The driver and his helper are unloading wood onto the ground.
Example Output: weakener

Example Input: Premise: A brown dog lies on a blanket in boat.
Hypothesis: A dog lies on a blanket in a yacht.
Update: The boat cost a lot of money.
Example Output:
strengthener