import java.util.Scanner; 
import java.util.*;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        //一共多少数字
        int n = scanner.nextInt();
        Set<Integer> set = new TreeSet<Integer>();
        for (int i = 0; i < n; i++) {
            set.add(scanner.nextInt());
        }
        //换行依次打印
        set.stream().forEach(System.out::println);
    }
}