#丧病啊，不区分大小写稍微处理了下
current_users=['Niuniu','Niumei','GURR','LOLO']
new_users=['GurR','Niu Ke Le','LoLo','Tuo Rui Chi']
current_users = list(map(lambda x : x.lower(), current_users))
# new_users = list(map(lambda x : x.lower(), new_users))
for i in new_users:
    if i.lower() in current_users:
        print('The user name '+i+' has already been registered! Please change it and try again!')
    else:
        print('Congratulations, the user name '+i+' is available!')