content: import java.io.*;
  import java.util.*;
  class Node{
  	int data;
  	Node next;
  	Node(int d){
          data=d;
          next=null;
      }
  	
  }
  class Solution
  {
  
        public static Node removeDuplicates(Node head) {
          Node curr = head;
          while (curr != null && curr.next != null) {
              while (curr.next != null && curr.data == curr.next.data) {
                  curr.next = curr.next.next;
              }
              curr = curr.next;
          }
          return head;
      }
  
  
      public static  Node insert(Node head,int data)
      {
          Node p=new Node(data);			
          if(head==null)
              head=p;
          else if(head.next==null)
              head.next=p;
          else
          {
              Node start=head;
              while(start.next!=null)
                  start=start.next;
              start.next=p;
  
          }
          return head;
      }
      public static void display(Node head)
          {
                Node start=head;
                while(start!=null)
                {
                    System.out.print(start.data+" ");
                    start=start.next;
                }
          }
          public static void main(String args[])
          {
                Scanner sc=new Scanner(System.in);
                Node head=null;
                int T=sc.nextInt();
                while(T-->0){
                    int ele=sc.nextInt();
                    head=insert(head,ele);
                }
                head=removeDuplicates(head);
                display(head);
  
         }
      }