import java.util.*;
class Dup{
    public static void main(String args[]){
        Scanner s = new Scanner(System.in);
        int n = s.nextInt();
        if(n<0){
            system.out.println("Invalid input");
            return;
        }
        LinkedHashSet<Integer> set = new LinkedHashSet<>();
        for(int i = 0; i<n; i++){
            int a = s.nextInt();
            set.add(a);
        }
        for(int b : set){
            System.out.print(b +" ");
        }
    }
}