<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def write(self, chars, output, format='png'):
 """Generate and write an image CAPTCHA data to the output. :param chars: text to be generated. :param output: output destination. :param format: image file format """

        im = self.generate_image(chars)
        return im.save(output, format=format)