With no explanation, label text_A→text_B with either "strengthener" or "weakener".
text_A: A young boy wearing safety glasses uses a hammer to break up rocks while a man in plaid pants stands nearby leaning on a cane. A young boy wearing safety glasses uses a hammer to break rocks containing gold as an older foreman looks at him leaning on a cane.
text_B: They are building a wall.
weakener.