Predict the output of the following code:

 class Employee
 {
     protected int empId;

     public Employee(int empId)
     {
         this.empId = empId;
     }
 }
 class Manager : Employee
 {
     public void Display()
     {
         Console.WriteLine("Employee Id : {0}", empId);
     }
 }
 class Program
 {
     public static void Main()
     {
         Manager mgrObj = new Manager();
         mgrObj.Display();
     }
 }

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