def parse_sensor_values(data):
    """
    Input line: <humidity>,<temperature>,<sound>
    Output structure:
        {
            'humidity': <humidity>,
            'temperature': <temperature>,
            'sound': <sound>
        }
    """
    metrics = ['humidity', 'temperature', 'sound']
    values = data.decode('utf-8').strip().split(',')
    return dict(zip(metrics, values))