TASK DEFINITION: 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.
PROBLEM: Premise: A man in a baseball cap playing a black acoustic guitar.
Hypothesis: A male musician in a baseball cap playing on his black acoustic guitar as other give him money on a street corner.
Update: Passersby clapped enthusiastically as the music continued and then placed dollar bills in his open guitar case on the sidewalk.

SOLUTION: strengthener

PROBLEM: Premise: A crowded sidewalk in the inner city of an Asian country.
Hypothesis: They are in Shanghai.
Update: the inner city is sprawling with an enormous developed skyline

SOLUTION: strengthener

PROBLEM: Premise: A puppy is gnawing on a plant branch in an uncut grassy area with wood and a barrel nearby.
Hypothesis: A puppy is in the backyard gnawing on assorted plant matter.
Update: The puppy is behind someone's house.

SOLUTION:
strengthener