Python program for a car game

command=""
started=False
while True:
    command=input(">").lower()
    if command=="start":
       if started:
          print("car is already started!")
       else:
            started=True
            print("car started...")
    elif command=="stop":
         if not started:
                print("car is already stopped!")
         else:
                started= False
                print("car stopped...")
    elif command=="help":
       print("""
    start-to start the car
    stop -to stop the car
    quit-to quit
""")
    elif command=="quit":
         break
    else:
        print("sorry, I don't understand that")