def get_seat_ID(seat_string: str) -> int:
    """Take in seat string and calculate its ID.

    Args:
        seat_string (str): self-explantory

    Returns:
        int: seat ID
    """
    row_string = seat_string[:-3]
    col_string = seat_string[-3:]

    row_binary = row_string.replace("F", "0").replace("B", "1")
    col_binary = col_string.replace("L", "0").replace("R", "1")

    row_num = int(row_binary, 2)
    col_num = int(col_binary, 2)

    return 8 * row_num + col_num