SSN Mask for Input Box without changing the Model Value for Angular JS

var app = angular.module('plunker', []);

app.controller('MainCtrl', function($scope) {
  $scope.modelssn = '';
});


app.directive("ssnInput",function(){
    return {
        require:'ngModel',
        link: function(scop, elem, attr, ngModel){
            $(elem).mask("999-99-9999");
            var temp;
            var regxa = /^(\d{3}-?\d{2}-?\d{4})$/;
            $(elem).focusin(function(){
                $(elem).val(temp);
            });
            $(elem).on('blur',function(){
               temp = $(elem).val();
               if(regxa.test($(elem).val())){
                   $(elem).val("XXX-XX" + temp.slice(6));
               }
            });
        }
    }
});

<!DOCTYPE html>
<html ng-app="plunker">

  <head>
    <meta charset="utf-8" />
    <title>AngularJS Plunker</title>
    <script>document.write('<base href="' + document.location + '" />');</script>
    <link rel="stylesheet" href="style.css" />
    <script src="https://code.jquery.com/jquery.js"></script>
    <script src="https://cdn.rawgit.com/digitalBush/jquery.maskedinput/master/src/jquery.maskedinput.js"></script>
    <script data-require="angular.js@1.5.x" src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.11/angular.min.js" data-semver="1.5.11"></script>
    <script src="app.js"></script>
  </head>

  <body ng-controller="MainCtrl">
    <input type="text" ng-model="modelssn" ssn-input >
    <p>Real SSN {{modelssn}} !</p>
  </body>

</html>

/* Put your css in here */