CREATE TABLE table_33178 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What is the away team score when the away team is Essendon?
SELECT "Away team score" FROM table_33178 WHERE "Away team" = 'essendon'
SELECT "Away team score" FROM "table_33178" WHERE "Away team" = 'essendon'