CREATE TABLE table_203_591 (id DECIMAL, "high school" TEXT, "join\ year" TEXT, "from" TEXT, "left" TEXT, "league left to" TEXT)

how many schools left the genesee county b league before ainsworth ?
SELECT COUNT("high school") FROM table_203_591 WHERE "left" < (SELECT "left" FROM table_203_591 WHERE "high school" = 'ainsworth')
SELECT COUNT("high school") FROM "table_203_591" WHERE "left" < (SELECT "left" FROM "table_203_591" WHERE "high school" = 'ainsworth')