CREATE TABLE "round_15" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);

Question: When South Melbourne was the Away Team, what was their score?
SQL: SELECT "away_team_score" FROM "round_15" WHERE "away_team"='south melbourne';