class VacuumCleaner:
    def __init__(self):
        self.location = (0, 0)

    def move(self, direction):
        x, y = self.location
        if direction == "up":
            x -= 1
        elif direction == "down":
            x += 1
        elif direction == "left":
            y -= 1
        elif direction == "right":
            y += 1
        self.location = (x, y)

    def clean_environment(self, environment):
        while "dirty" in environment.values():
            if environment[self.location] == "dirty":
                print(f"Cleaning location: {self.location}")
                environment[self.location] = "clean"
            if self.location[1] % 2 == 0: 
                self.move("right")
            else:
                self.move("left")
environment = {(i, j): "dirty" for i in range(3) for j in range(3)}
vacuum_cleaner = VacuumCleaner()
vacuum_cleaner.clean_environment(environment)