python用set和list转换一下就可了

while True:
    try:
        len1, list1, len2, list2 = int(input()), list(map(int, input().split())), int(input()), list(map(int, input().split()))
        list1.extend(list2)
        list_concat = list(set(list1))
        print(''.join(map(str, sorted(list_concat))))
    except:
        break