def task_6_6():
    move_right()
    while True:
        if not wall_is_above():
            while not wall_is_above():
                move_up()
                fill_cell()
            while not wall_is_beneath():
                move_down()
        if wall_is_on_the_right():
            break
        move_right()
    while wall_is_beneath():
        move_left()