def get_elb_listeners(listeners=None):
    """
    @type listeners: list
    """
    output = ''
    for listener in listeners:
        listener_config = listener.get('Listener')
        output += (
            'LB Port: {0} \nLB Protocol: {1} \nInstance Port: {2} \nInstance Protocol: {3}\n'
            .format(listener_config.get('LoadBalancerPort', '-'),
            listener_config.get('Protocol', '-'), listener_config.get(
            'InstancePort', '-'), listener_config.get('InstanceProtocol', '-'))
            )
    if output:
        return output.rstrip()
