print public dns name of ec2 instance

[Benjamin Fernandis]

Hi,

I am testing to print ec2 instance public dns names by ansible.

- hosts:  localhost

  connection: local

  

  tasks:

    - name: get instance public dns name

      ec2_remote_facts:

        region: ap-southeast-2

        filters:

          instance-state-name:  running

      register: ec2

    - debug:  var=ec2.instances.public_dns_name

but i got " "ec2.instances.public_dns_name": "VARIABLE IS NOT DEFINED!" .

where i m doing mistake? 

Thanks

Benjo