import java.util.*;
public class Main{
    public static void main(String[] args) {  
        Scanner scan=new Scanner(System.in);  
        TreeSet ts=new TreeSet();  //TreeSet无重复排序
        while(scan.hasNext())  
        {  
            int m=scan.nextInt();  
            for(int i=0;i<m;i++){  
                ts.add(scan.nextInt());  
            }  
            int n=scan.nextInt();  
            for(int i=0;i<n;i++){  
                ts.add(scan.nextInt());  
            }  
            Iterator it=ts.iterator();  
            while(it.hasNext())  
            {  
                System.out.print(it.next());  
            }  
        }
    }  
}