题解 | #代理服务器#

while True:
    try:
        num1 = int(input())
        list1 = []
        list3 = []
        for i in range(num1):
            list1.append(input())
            list3.append(0)
        num2 = int(input())
        list2 = []
        count = 0
        flag = 0
        for i in range(num2):
            list2.append(input())
        for i in range(num2):
            for j in range(num1):
                if list1[j] == list2[i]:
                    list3[j] = 1
                if list1[j] == list2[i] and sum(list3)==len(list3):
                    flag = 1
                    count += 1
                    for k in range(num1):
                        if k == j:
                            continue
                        list3[k] = 0
        if flag == 0 or num1 == 1:
            print(-1)
            continue
        print(count)
        
    except EOFError:
        break