import java.util.Scanner;

class Node {
    private int data;
    private Node next;

    public Node (int value, Node ref){
        data = value;
        next = ref;
    }

    public int getData(){
        return data;
    }

    public Node getNextReference(){
        return next;
    }

    public void setNextReference(Node value){
        next = value;
    }
}

class LinkedList {
    private Node head;
    private Node tail;

    public LinkedList(){
        head = null;
        tail = null;
    }

    public void insertAtBack(int word){
        if (head == null){
            head = new Node(word, null);
            tail = head;
        }
        else{
            Node tempref = tail;
            tail = new Node (word, null);
            tempref.setNextReference(tail);
        }
    }

    public void printList(){
        if (head == null)
            System.out.println ("The List is Empty");
        else{
            Node tempref = head;
            System.out.println("The values so far in the list : ");
            while (tempref != null){
                System.out.print(tempref.getData());
                tempref = tempref.getNextReference();
                if (tempref != null)
                {
                    System.out.print (" --> ");
                }
            }
            System.out.println("\n");
        }
    }
}

public class LinkedListTest {

    public static void Menu(){
        System.out.println ("1 - Insert At Back ");
        System.out.println ("2 - Quit");
    }

    public static void main (String args []){
        System.out.println ("Linked Lists");
        Scanner scanner = new Scanner (System.in);
        Scanner scanner1 = new Scanner (System.in);

        int choice = 0, status = 0, entry = 0;
        boolean flag = true;
        LinkedList list = new LinkedList();

        while (flag){

            Menu();
            status = 0;

            try{
                choice = Integer.parseInt(scanner.nextLine());
            }
            catch (Exception e){
                System.out.println("Integers Only - Enter Again");
                status = 1;
            }

            if (choice == 1){
                System.out.println ("Enter the value?");
                entry = scanner1.nextInt();
                list.insertAtBack(entry);
            }
            else if (choice == 2){
                flag = false;
                System.out.println ("End of Program");
            }
            else if (status == 0){
                System.out.println ("Invalid Entry - Enter Again");
            }
            list.printList();
        }
    }
}