Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_26393 ( "No." real, "Title" text, "Directed by" text, "Written by" text, "Original air date" text, "Production code" text, "U.S. viewers (million)" text )

### Question ###
How many directors worked on the episode written by Brent Fletcher & Miranda Kwok?

### Accurate SQL ###

SELECT COUNT("Directed by") FROM table_26393 WHERE "Written by" = 'Brent Fletcher & Miranda Kwok'