import java.util.Scanner; import java.util.TreeSet; // 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 in = new Scanner(System.in); // 注意 hasNext 和 hasNextLine 的区别 while (in.hasNextInt()) { // 注意 while 处理多个 case int a = in.nextInt(); TreeSet<Integer> set = new TreeSet(); for (int i = 0; i < a; i++) { set.add(in.nextInt()); } int b = in.nextInt(); for (int i = 0; i < b; i++) { set.add(in.nextInt()); } for (Integer i : set) { System.out.print(i); } } } }