while True: try: m = int(input()) list1 = list(map(int,input().split())) n = int(input()) list2 = list(map(int,input().split())) total_list = list1 + list2 sorted_list=sorted(total_list) new_list=[] for num in sorted_list: if num not in new_list: new_list.append(num) print(''.join(map(str,new_list))) except: break