user: Question: How many different heights are there for the contestants from Warsaw?
Columns: ['Country', 'Contestant', 'Age', 'Height (cm)', 'Height (ft)', 'Hometown']
Types: ['text', 'text', 'real', 'real', 'text', 'text']
Sample row: ['Argentina', 'Alejandra Bernal', 20.0, 178.0, '5\'10"', 'San Salvador de Jujuy']
SQL:

assistant: SELECT COUNT("Height (ft)") FROM "Table" WHERE "Hometown" = 'Warsaw';