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.

Input: Consider Input: Premise: An African American man smiling.
Hypothesis: The man is showing his teeth to a doctor.
Update: The man is knocking on a door

Output: weakener


Input: Consider Input: Premise: A man in a yellow construction hat with a tool bag on his back, is drilling a wall labeled superior walls.
Hypothesis: A construction worker is building the walls to a house.
Update: The wall has windows in it.

Output: strengthener


Input: Consider Input: Premise: A barber and a seated client in a barber shop hung with bright, flower-patterned draperies.
Hypothesis: A barber is cutting hair.
Update: The barber found the shears.


Output: strengthener