/**
 *
 * Ashish Patel
 * e: ashishsushilPatel@gmail.com
 * w: https://ashish.me
 *
 */

class DoublyNode {
  int data;
  DoublyNode prev;
  DoublyNode next;

  DoublyNode(int d) {
    data = d;
    prev = null;
    next = null;
  }
}