iphone7 = ['lin','yao','hong','ding','qiao']
iphone8 = ['lin','xiao','hong','mao','wang']
user = []
user7 = []
user8 = []
for names in iphone7:
    if names in iphone8:
        user.append(names)
    else:
       user7.append(names)
for names in iphone8:
    if names not in iphone7:
        user8.append(names)
print(user)
print(user7)
print(user8)
#user9 = user7 + user8
user7.extend(user8)
print(user7)
user9 = user7
print(user9)