def parse_pages(pages):
    """
    Give a string possibly containing a start and end page, return the start and end page if any
    :param pages:
    :return: list with start and end pages
    """
    if '-' in pages:
        k = pages.find('-')
        start = pages[0:k]
        end = pages[k + 1:]
    else:
        start = pages
        end = ''
    return [start, end]