With no explanation, label text_A→text_B with either "strengthener" or "weakener".
text_A: A man in a baseball cap playing a black acoustic guitar. A male musician in a baseball cap playing on his black acoustic guitar as other give him money on a street corner.
text_B: Passersby clapped enthusiastically as the music continued and then placed dollar bills in his open guitar case on the sidewalk.
strengthener.