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 hiker walks on rocky ground at the base of a foggy mountain.
Hypothesis: The hiker is looking for a ledge to climb.
Update: He just came from the top of the mountain.
Example Output: weakener

Example Input: Premise: Cheerleaders perform.
Hypothesis: The Cheerleaders are shaking their pom poms
Update: The cheerleaders did a gymnastics routine.
Example Output: weakener

Example Input: Premise: Three black dogs playing on the beach.
Hypothesis: The dogs are fast
Update: The dogs are whippets.
Example Output:
strengthener