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_2799 ( "Club" text, "Location" text, "Manager" text, "Stadium" text, "Capacity" real, "Team captain" text )

### Question ###
How many different team captains does the club Sliven 2000 have?

### Accurate SQL ###

SELECT COUNT("Team captain") FROM table_2799 WHERE "Club" = 'Sliven 2000'