from collections import deque

moving_direction = deque()


class Controller:
    def __init__(self):
        pass

    def move_forward(self, repeat):
        for time in range(repeat):
            moving_direction.appendleft('forward')

    def move_right(self, repeat):
        for time in range(repeat):
            moving_direction.appendleft('right')

    def move_back(self, repeat):
        for time in range(repeat):
            moving_direction.appendleft('back')

    def move_left(self, repeat):
        for time in range(repeat):
            moving_direction.appendleft('left')