class Node{

Node next;
Node previous;
int data;

public Node(int data){
    this.data = data;
}

}
public class LinkedList {
Node head;


public Node push(int data){
    Node temp = this.head;
    if(head == null){
    Node newNode = new Node(data);
    newNode.next = head;
    return head = newNode;
    }
    else{
    while(temp!=null){
        temp.next = new Node(data);
    }}
    return temp;
    }

    public Node insertAtEnd(int data){
    while(head!=null){
    head.next = new Node(data);
    }
    return head.next;
    }



     public void printList() {
     Node temp = this.head;
     while (temp != null) {
    System.out.print(temp.data + "-->");
    temp = temp.next;
    }
    System.out.println(temp);
    }