def draw_cow(speech_bubble):
    """Draws the ASCII cow to speak the message.
       Param: speech_bubble(str)
       Return: cow_image(str)"""
    cow_image = ""
    # add characters line by line to imitate ASCII art of a cow
    cow_image += speech_bubble
    cow_image += "\t\\    ^    ^\n"
    cow_image += "\t\\     _ _ \n"
    return cow_image