Substitute value from one controller to another in Angularjs?

Question

Angular

Hello,
tell me there is a code below, how to substitute the value from another controller into the #cqnum input when clicking on the button from (CController)

<div ng-controller="BController" ng-init="init()">
  <input type="text" id="cqnum" ng-model="cqnum"/>
  <button  ng-click="Create2()">Сохранить 2</button>
</div>
<div ng-controller="CController" ng-init="init()" style="height: 100%;width:100%;">	
<button  ng-click="Create1()">Сохранить 1</button>
</div>

<script>
  pqsAppModule.service('shareData', function() {
    return {
        setData : setData,
        getData : getData,
        shared_data : {} 
    }

    function setData(data) {
        this.shared_data = data
    }

    function getData() {
        return this.shared_data
    } 
})
</script>

<script type="text/javascript" charset="utf-8">
pqsAppModule.controller('BController',function($scope,shareData) {
  $scope.Create2 = function(stat){	
    console.log('send');	
    console.log(shareData.getData());
  }
});

</script>

<script type="text/javascript" charset="utf-8">
pqsAppModule.controller('CController',function($scope,shareData) {
  $scope.cq_id = 0;
  $scope.Create1 = function(stat){	
    $scope.cq_id= 123;
    shareData.setData(data=$scope.cq_id);
  }
});
</script>

That is, I get the value in (BController) and when I click on the button (BController) I see it, but I need to substitute the value from (CController) into the input (cqnum)