CREATE TABLE table_18626383_2 (height__cm_ VARCHAR, contestant VARCHAR)

When valora roucek is the contestant how many heights in centimeters are there?
SELECT COUNT(height__cm_) FROM table_18626383_2 WHERE contestant = "Valora Roucek"
SELECT COUNT("height__cm_") FROM "table_18626383_2" WHERE "Valora Roucek" = "contestant"