What was the Home team's score when the Away team scored 12.6 (78)?
CREATE TABLE "round_12" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);
SELECT "home_team_score" FROM "round_12" WHERE "away_team_score"='12.6 (78)';