AngularJS | Textarea character limit

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<div ng-app="" class="container">
  <div ng-controller="myController">
    <label>Message</label>
    <textarea rows="3" class="form-control" ng-trim="false" ng-model="inputMessage" minlength="10" maxlength="50"></textarea>
    <p class="text-right">{{ 50 - inputMessage.length + ' Char' }}</p>
  </div>
</div>

JavaScript

function myController($scope){
   $scope.maximum = 50;
}