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 bird's eye view of people walking up and down cement steps, most in silhouette except for two little girls.
Hypothesis: The girls are best friends.
Update: The girls are arguing.
Example Output: weakener

Example Input: Premise: Eight men work on scaffolding on a cloudless day.
Hypothesis: The eight men love to work on scaffolding when the days are cloudless.
Update: the men are laughing and singing while they work
Example Output: strengthener

Example Input: Premise: A mountain biker is riding on a woodland path.
Hypothesis: A mountain biker rides in the sun.
Update: The mountain biker is trying to maneuver in the dark.
Example Output:
weakener