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 young man jumping a back flip off of a concrete wall.
Hypothesis: The flip is high
Update: The wall is 10 feet tall
Example Output: strengthener

Example Input: Premise: Two people standing in a curved interior, multi-level building.
Hypothesis: The people are standing in an elevator inside.
Update: People are standing inside curved multi-level building.
Example Output: weakener

Example Input: Premise: A person is holding three birds.
Hypothesis: A person is selling birds.
Update: He is surrounded by cages, each with a different bird inside.
Example Output:
strengthener