import java.util.BitSet;
import java.util.Scanner;
public class Main {
public static void main(String[] args) { Scanner sc = new Scanner(System.in); int total = sc.nextInt(); BitSet set = new BitSet(total); for (int i=0; i < total; i++) { int num = sc.nextInt(); set.set(num); } for (int i=0; i<set.size(); i++) { if (set.get(i)) { System.out.println(i); } } }
}