import java.util.*;
public class Main { public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
while(true) {
if (!sc.hasNextInt())
break;
int n = sc.nextInt();
Set<Integer> set = new TreeSet<>();
for (int i = 0; i < n; i ++) {
int a = sc.nextInt();
set.add(a);
}
for (int i : set) {
System.out.println(i);
}
}
}
}