how to send the text to modal and model text to main screen?

Could you please tell me how to send the text to modal view and model view text to main screen? In my demo I have one text field and button. I need to send input text to modal and on modal I have one textfield and button I need to send that input field value on main screen. How we comunicate the main screen to modal screen. I need to send data to modal and get data from modal in angular here is my code:

http://codepen.io/anon/pen/BNabez

var app =angular.module('ionicApp',['ionic']);
app.controller('cntr',function($scope,$http,$ionicModal){
 $ionicModal.fromTemplateUrl('templates/modal.html', {
    scope: $scope
  }).then(function(modal) {
    $scope.modalFirst = modal;
  });
  $scope.openmodel=function(){
   // alert('d');
    $scope.modalFirst.show()
  }


})

You have to declare the variables in scope for that and then bind it i have edited your codepen

http://codepen.io/anon/pen/OVJGxm

HTML:

 <html ng-app="ionicApp">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no, width=device-width">

    <title>Sign-in, Then Tabs Example</title>

    <link href="//code.ionicframework.com/nightly/css/ionic.css" rel="stylesheet">
    <script src="//code.ionicframework.com/nightly/js/ionic.bundle.js"></script>

  </head>

  <body ng-controller="cntr">

   <ion-view>
    <ion-header-bar class="bar-balanced">
        <h1 class="title">load data before modal show</h1>
    </ion-header-bar>
    <ion-content scroll="false">

     <button ng-click="openmodel()">send data on popup screen </button>
       <input type="text" placeholder="Say Something" ng-model="input.saySomething"/>
      <h1>{{item.text}}</h1>
    </ion-content>
    <ion-footer-bar class="bar-balanced">
        <h1 class="title">Footer</h1>
    </ion-footer-bar>
</ion-view>
   <script id="templates/modal.html" type="text/ng-template">
      <ion-modal-view>
      <ion-header-bar class="bar-balanced">
        <h1 class="title">departure</h1>
    </ion-header-bar>
    <ion-content>
      <h1>naveen+{{input.saySomething}}</h1>
       <input type="text" ng-model="item.text">
      <button>send to main screen</button>
    </ion-content>
    <ion-footer-bar class="bar-balanced">
        <h1 class="title">Footer</h1>
    </ion-footer-bar>
      </ion-modal-view>
    </script>
  </body>
</html>

js:

var app =angular.module('ionicApp',['ionic']);
app.controller('cntr',function($scope,$http,$ionicModal){
  $scope.item={};
  $scope.input={};
 $ionicModal.fromTemplateUrl('templates/modal.html', {
    scope: $scope
  }).then(function(modal) {
    $scope.modalFirst = modal;
  });
  $scope.openmodel=function(){
   // alert('d');
    $scope.modalFirst.show()
  }


})