class Car:

    def __init__(self, speed=0):
        self.speed = speed
        self.odometer = 0
        self.time = 0

    def say_state(self):
        print("I'm going {} kph!".format(self.speed))


    def accelerate(self):
        self.speed += 5

    def brake(self):
        self.speed -= 5

    def step(self):
        self.odometer += self.speed
        self.time += 1

    def average_speed(self):
        if self.time != 0:
            return self.odometer / self.time
        else:
            pass
        if __name__ == '__main__':
            my_car = Car()
            print("I'm a car!")
        while True:
            action = input("What should I do? [A]ccelerate, [B]rake, " "show [O]dometer, or show average [S]peed?").upper()

            if action not in "ABOS" or len(action) != 1:
                print("I don't know how to do that")
                continue
            if action == 'A':
                my_car.accelerate()

            elif action == 'B':
                my_car.brake()
            elif action == 'O':
                print("The car has driven {} kilometers".format(my_car.odometer))
            elif action == 'S':
                print("The car's average speed was {} kph")