Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
How many different items appear in the weight column when Pittsburgh, PA is the hometown?

### Inputs:
table_name: table, columns: ['Name', '#', 'Position', 'Height', 'Weight ( lb. )', 'Year', 'Hometown', 'Previous School']

### Response:
SELECT COUNT Weight ( lb. ) FROM table WHERE Hometown = Pittsburgh, PA