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: Two boys playing on a trampoline.
Hypothesis: Two boys playing chess on a trampoline.
Update: There is a checkered board on top of the trampoline.
Example Output: strengthener

Example Input: Premise: A person jumps off of a cliff into the water below as others watch.
Hypothesis: She made a great dive.
Update: She made a big splash
Example Output: weakener

Example Input: Premise: A man with two children watching birds.
Hypothesis: A man is bird watching with his kids
Update: He teaches them the names of some local birds.
Example Output:
strengthener