题解 | #整型数组合并#

'''
a=(1,2,5)
b=(-1,0,3,2)
print(sorted(set(a+b)))
#c=set(1 2 3 4)
#print(c)
'''
'''
while True:
    try:
        n_a=int(input())
        a=input().split()
        n_b=int(input())
        b=input().split()
        a1=[int(i) for i in a]
        b1=[int(i) for i in b]
        #print(a1,b1)  # 字符型列表，影响排序
        c=set(a1+b1)
        #print(c,type(c))
        c1=sorted(c)
        #print(c1,type(c1))
        print(''.join(map(str,c1)))
    except:
        break
'''

while 1:
    try:
        a=int(input())
        n1=input().split()
        b=int(input())
        n2=input().split()
        n=map(str,sorted(map(int,set(n1+n2))))
        #print(n)
        print(''.join(n))  #join 只能拼接字符

    except:
        break