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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def subscribe_sns_topic_to_sqs(self, region):
 """Subscribe SQS to the SNS topic. Returns the ARN of the SNS Topic subscribed Args: region (`str`):
 Name of the AWS region Returns: `str` """

        sns = self.session.resource('sns', region_name=region)
        topic = sns.Topic('arn:aws:sns:{}:{}:{}'.format(region, self.account.account_number, self.topic_name))

        topic.subscribe(Protocol='sqs', Endpoint=self.sqs_queue)

        auditlog(
            event='cloudtrail.subscribe_sns_topic_to_sqs',
            actor=self.ns,
            data={
                'account': self.account.account_name,
                'region': region
            }
        )

        return topic.attributes['TopicArn']