== 미로찾기 ==
{{{
def checkLeft():
    if left_is_clear():
        turn_left()
        move()
    elif front_is_clear():
        move()
    elif right_is_clear():
        turn_right()
        move()
    else :
        turn_left()
        turn_left()
        move()
        
while on_beeper:
    checkLeft()
    if on_beeper():
        turn_off()
turn_off()
}}}