class LinkedStack<E> {
    private SinglyLinkedNode head;
    //OuterClass.InnerClass innerObject = outerObject.new InnerClass()

  ////////////////////////////////////////////////
    ////Inner CLass
      class SinglyLinkedNode<E> {

          E data;
          SinglyLinkedNode<E> next;

          SinglyLinkedNode(E d) {
              data = d;
              next = null;
          }
      }
  ////////////////////////////////////////////
    public LinkedStack(){

    }

    public boolean isEmpty(){
        return head == null;
    }

    public E pop(){

        return ;
    }

public void push(E item) {
    SinglyLinkedNode<E> node = new SinglyLinkedNode>(item);
    node.next = head;
    head = node;

    //size++;
}
}