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 man with a conductors hat sticks his head out the window and leans on the windowsill of the train.
Hypothesis: A man sticks his head out of the window.
Update: The man's hair blows in the wind.
Example Output: strengthener

Example Input: Premise: A group of volunteers help build a house on behalf of Habitat for Humanity.
Hypothesis: Tall beings building
Update: The group of volunteers are average height.
Example Output: weakener

Example Input: Premise: Four teen girls and two teen boys are all jumping in the air in front of the glass doors to a building.
Hypothesis: People are having fun.
Update: There is a working unlocking the doors.
Example Output:
weakener