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: A slender man, shirtless with tattoos, carries his skateboard while making a displeased face.
Hypothesis: A shirtless man with a skateboard is unhappy that he didn't win a contest
Update: The man just checked his bank account balance and found it was overdrawn.
Example Output: weakener

Example Input: Premise: Three men stand on a sidewalk wearing construction hats.
Hypothesis: The constuction crew is waiting for the next delivery of supplies
Update: The men are watching and waiting for a truck to arrive.
Example Output:
strengthener