def SessionNum(session):
    """
    :param session: String  with number of session.
    >>> SessionNum(session='Session: 9562D061; timeout=60')
    9562D061
    :return: Number of Session.
    """
    num1 = session.find('Session:')
    num1 += 9
    SessiontTime = session[num1:]
    num2 = SessiontTime.find(';')
    session = SessiontTime[:num2]
    return session