Show InputBox

def show_input(self, template_helper, language, seed):
        """ Show InputBox """
        header = ParsableText(self.gettext(language, self._header), "rst",
                              translation=self._translations.get(language, gettext.NullTranslations()))
        return str(DisplayableCodeSingleLineProblem.get_renderer(template_helper)
                   .tasks.single_line_code(self.get_id(), header, "text", 0, self._optional, self._default))