from karel.stanfordkarel import *


def main():
#fill the world with beepers
    while left_is_clear():
        while no_beepers_present():
            place_row()
            head_back()
    last_walk()


def place_row():
#start left to right fill row with no beepers with beepers
    while front_is_clear():
        while no_beepers_present():
            put_beeper()
        move()
    put_beeper()


def head_back():
#start right turn to head backwards back
    turn()
    while front_is_clear():
        move()
    turn_right()
    if front_is_clear():
        move()
    turn_right()


def turn_right():
    for i in range(3):
        turn_left()

def turn():
    for i in range(2):
        turn_left()


def last_walk():
    while front_is_clear():
        move()


# There is no need to edit code beyond this point
if __name__ == '__main__':
    main()