import enum


class SlashType(enum.Enum):
    FORWARD = enum.auto()
    BACKWARD = enum.auto()


def count_regions_in_slashes_grid(slashes_grid: list[list[SlashType]]):
    pass


assert (count_regions_in_slashes_grid([
    [SlashType.FORWARD, SlashType.BACKWARD, SlashType.FORWARD],
    [SlashType.BACKWARD, SlashType.FORWARD, SlashType.BACKWARD,
]]) == 6)