import java.util.*;
import java.lang.*;
import java.io.*;

public class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
                Scanner sc= new Scanner(System.in);
                int n= sc.nextInt();
                Ll l1= new Ll();
                for(int i=0;i<n;i++)
                        l1.insert(sc.nextInt());
                l1.removeDuplicates();
                l1.print();
	}
}
class Node
        {
                int val;
                Node next;
                Node(int val)
                {
                        this.val=val;
                        next=null;
                }
        }
class Ll
        {
                Node head,curr;
                void insert(int val)
                {
                        Node n= new Node(val);
                        if(head==null)
                        {
                                head=n;
                                curr=n;
                                return;
                        }
                        curr.next=n;
                        curr= curr.next;
                        return;
                }
                void print()
                {
                        if (head==null)
                                return;
                        Node temp=head;
                        while(temp!=null ){
                                System.out.print(temp.val+" ");
                                temp=temp.next;
                        }
                        return;
                }
                void removeDuplicates()
                {
                        if(head==null)
                            return;
                        Node temp=head;
                        int last=-1;
                        Node l=new Node(-1);
                        Node ret=l;
                        while(temp!=null){
                                if(temp.val!=last){
                                        if(temp.next==null || temp.next.val!=temp.val){
                                                l.next=temp;
                                                l=temp;
                                        }
                                }
                                last=temp.val;
                                temp=temp.next;
                        }
                        l.next=null;
                        head=ret.next;
                        return;
                }
        }