Create sequential file names or EC2 instance tags with Ansible

naming_sequence.yml

---

- name: naming sequence
  connection: local
  hosts: localhost
  vars:
    - names: ['cs','cs','cs','cs','cs',]
    - numbers: []
    - n_instances: 5

  tasks:
    - name: create a list of numbers
      set_fact:
        numbers: "{{numbers}} + ['{{item}}']"
      with_sequence: start=1 end={{ n_instances }} format=%03d

    - name: parallel loop
      debug: 
        msg: "instance name is {{ item.0 }}-{{ item.1 }}"
      with_together:
        -  "{{ names }}"
        -  "{{ numbers }}"