From the perspective of Declarer's hand, how many losers do you have in a heart contract (no lead given).
4: 2 spades, 0 hearts, 1 diamond, and one club. You might lose a spade here if the suit is 3-3. You should test the suit before drawing all the trumps from dummy. You may be able to get rid of the club on a diamond or spade if your opponents are helpful and don't get aroundt o playing clubs soon enough.