Among all the Olympic competitors from Finland, how many of them are female?
competitors from Finland refer to id where region_name = 'Finland'; female refers to gender = 'F';
SELECT COUNT(T3.id) FROM noc_region AS T1 INNER JOIN person_region AS T2 ON T1.id = T2.region_id INNER JOIN person AS T3 ON T2.person_id = T3.id WHERE T1.region_name = 'Finland' AND T3.gender = 'F'