class A
{
    public A()
    {
      System.out.println("I am a");
    }
    
    public static void main(String arg[])
    {
      A a = new A();
      //B b = new B();
      C c = new C();
      D d = new D();
    }
    
    class B
    {
        public B()
        {
            System.out.println("I am b");
        }
    }
    
    static class C
    {
        public C()
        {
            System.out.println("I am c");
        }
    }
} 

class D
{
    public D()
    {
        System.out.println("I am d");
    }
}