user: Question: How many directors of episode 55?
Columns: ['Series no.', 'No. in season', 'Title', 'Written by', 'Directed by', 'Original air date']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [46.0, 1.0, '"Mr. Monk and the Other Detective"', 'Hy Conrad', 'Eric Laneuville', 'July8,2005']
SQL:

assistant: SELECT COUNT("Directed by") FROM "Table" WHERE "Series no." = 55.0;