user: Question: What is the total number of ranks that had vestron as the studio?
Columns: ['Rank', 'Title', 'Studio', 'Director', 'Gross']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Three Men and a Baby', 'Touchstone', 'Leonard Nimoy', '$167,780,960']
SQL:

assistant: SELECT COUNT("Rank") FROM "Table" WHERE "Studio" = 'vestron';