就字典的运用,初始值赋值挺难搞的

``` python []
while True:
    try:
        n1=int(input())
        s1=list(map(str, input().split()))
        n2=int(input())
        s2=list(map(str, input().split()))
        dic={}
        for i in s1:#初始化
            dic[i]=0
        #dic["Invalid"]=0#第一种方式
        dic.update({"Invalid":0})#第二种方式,用update,参数为字典对象
        for i in s2:
            if i in s1:#如果i in s1
                dic[i]+=1
            else:
                dic["Invalid"]+=1
        #print(dic)#测试用
        for k,v in dic.items():
            print("{0} : {1}".format(k, v))
    except:
        break