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_1784514_1 ( number_of_powiats VARCHAR, capital VARCHAR )

### Question ###
How many powiats have mstsislaw as a capital?

### Accurate SQL ###

SELECT number_of_powiats FROM table_1784514_1 WHERE capital = "Mstsislaw"