New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'input demo',
  myValue: 'Write',
  myInitialValue: Ember.computed.defaultTo('myValue')
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
<input type="text" value={{myInitialValue}} oninput={{action (mut myValue) value="target.value"}}>
<br>
<br>
{{myValue}} 

twiddle.json

{
  "version": "0.4.7",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.6/ember.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/1.13.7/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.6/ember-template-compiler.js"
  }
}