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 on a motorcycle is towing a bicyclist on his bicycle behind him.
Hypothesis: A man on a red motorcycle is towing a bicyclist on a blue bicycle.
Update: The bicyclist's black helmet matches the color of his bike.
Example Output: weakener

Example Input: Premise: Bikers stopped on a road.
Hypothesis: Biker men sitting on bikes conversing.
Update: The bikers are sitting on the road but not even looking at each other.
Example Output: weakener

Example Input: Premise: A woman in fishnet stockings competes in a roller derby.
Hypothesis: There are other competitors visible.
Update: There is a person trying to pass to her left.
Example Output:
strengthener