def _get_number_from_sign(sign):
        """
        Captures numbers after sign for __convert_num__.

        input = ["a", "a1", "be2", "bad3", "buru14"]
        output = [0, 1, 2, 3, 14]

        :param sign: string
        :return: string, integer
        """
        match = re.search(r'\d{1,3}$', sign)
        if match is None:
            number = 0
        else:
            number = match[0]
        return sign, int(number)