import sys
n = int(input())
list1 = list(map(int,sys.stdin.readline().strip().split()))
m = int(input())
list2 = list(map(int,sys.stdin.readline().strip().split()))
# print(list1)
# print(list2)
list3 = []
for i in list1:
    list3.append(i)
for j in list2:
    list3.append(j)
# print(list3)
list3 = sorted(list(set(list3)))
print(*list3,sep='',end = '')
# 或者改成字符串再输出也可以