The "+" and "-" symbols indicate the underdog and the favorite in a spread betting scenario, respectively. If a team has a +3.5-point spread, it means they are the underdog and are expected to lose by 3.5 points. Conversely, a team with a -3.5-point spread is the favorite and expected to win by 3.5 points. Your goal is to predict whether the favorite will win by more than the given spread or if the underdog will keep the match closer than the spread.