/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Integer[] arr1 = { 1, 6, -6, -9, 3, 4, -8, -7 };
		Integer[] arr2 = { 5, 3, 2, 1, 70, 6, 7, -9, 99, 81 };
	    Collection<Integer> result = new TreeSet<Integer>(Arrays.asList(arr1));
	    result.addAll(Arrays.asList(arr2));
		System.out.println(result.toString().replaceAll("\\[|\\]", "").replaceAll(", ","\t"));
	}
}