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_19663 ( "Year" real, "Mens singles" text, "Womens singles" text, "Mens doubles" text, "Womens doubles" text, "Mixed doubles" text )

### Question ###
Name the number of years for womens doubles being diana koleva emilia dimitrova and jeliazko valkov

### Accurate SQL ###

SELECT COUNT("Year") FROM table_19663 WHERE "Womens doubles" = 'Diana Koleva Emilia Dimitrova' AND "Mens singles" = 'Jeliazko Valkov'