While Loop Exercise - Cake

width = int(input())
length = int(input())

cake_area = width * length
all_pieces = 0

while cake_area > all_pieces:
    pieces = input()
    if pieces == "STOP":
        pieces_left = cake_area - all_pieces
        print(f"{pieces_left} pieces are left.")
        break
    else:
        all_pieces += int(pieces)
        if cake_area - int(all_pieces) <= 0:
            print(f"No more cake left! You need {abs(cake_area - int(all_pieces))} pieces more.")
        else:
            continue