import java.util.*;

public class JoinArrays {
    public static void main(String[] args) {
        int[] arr1 = {8, 2, 6, 4};
        int[] arr2 = {9, 1, 5, 3, 7};

        Set<Integer> set = new TreeSet<>();
        for (int num : arr1) set.add(num);
        for (int num : arr2) set.add(num);

        for (int num : set) {
            System.out.print(num + " ");
        }
    }
}