import java.util.Arrays;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.Scanner;
import java.util.Set;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int arr[] = new int[n];
        for(int i=0;i<n;i++){
            arr[i] = in.nextInt();
        }
        Arrays.sort(arr);
        Set<Integer> set =new LinkedHashSet<>();
        for(int num:arr){
            set.add(num);
        }
        for(Integer num:set){
            System.out.println(num);
        }
    }
}