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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 verify2(self):
 """Last verification step. The derived keys (output, input) are returned here. """

        output_key = hkdf_expand('MediaRemote-Salt',
                                 'MediaRemote-Write-Encryption-Key',
                                 self._shared)

        input_key = hkdf_expand('MediaRemote-Salt',
                                'MediaRemote-Read-Encryption-Key',
                                self._shared)

        log_binary(_LOGGER, 'Keys', Output=output_key, Input=input_key)
        return output_key, input_key