<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _parse_mtu(self, config):
 """Parses the config block and returns the configured IP MTU value The provided configuration block is scanned and the configured value for the IP MTU is returned as a dict object. The IP MTU value is expected to always be present in the provided config block Args: config (str):
 The interface configuration block to parse Return: dict: A dict object intended to be merged into the resource dict """

        match = re.search(r'mtu (\d+)', config)
        return dict(mtu=int(match.group(1)))