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: The sky appears clear.
Hypothesis: The sky looked very clear at night.
Update: Many stars are visible.

Output: strengthener


Input: Consider Input: Premise: A woman in a brown sweater is collecting dirty dishes in a restaurant.
Hypothesis: the woman is a waitress
Update: Dishwashers collect dishes at this restaurant.

Output: weakener


Input: Consider Input: Premise: A man surfing a wave.
Hypothesis: A man is surfing in California.
Update: A man runs into the surf at Big Sur.


Output: strengthener