# Walks along the walls
# of a room.
#
# version 2

def turn_right():
    repeat(turn_left, 3)

put_beeper()
move()
while not on_beeper():
    if right_is_clear():
        turn_right()
        move()
    elif front_is_clear():
        move()
    else:
        turn_left()

pick_beeper()
turn_off()