You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. You are required to assign a label 'formal' if there is an absence of emotion and a presence of questions anywhere within the conversation. If such pattern is not found assign the label 'informal'.

Ex Input:
Person1: Have you obtained any certificate of technical qualifications or license ?
Person2:Yes , I have received an Engineers Qualification Certificate and a drivers license .
Person1: How many years have you had the drivers license ?
Person2:I have two years driving experience .
Person1: That ' s good . What special skills do you have , can you tell me ?
Person2:I have experience in computer operation , proficiency in Microsoft Windows , Microsoft Word and Microsoft Excel .
Person1: What computer languages have you learned ?
Person2:Visual C + + , C and Delphi .
Person1: Have you gotten any special training in programming ?
Person2:No , but I have database programming experience and network knowledge .

Ex Output:
formal

Ex Input:
Person1: What can I do for you today ?
Person2:I need to return a book .
Person1: Can I do anything else for you ?
Person2:I want to check this magazine out .
Person1: We don ' t allow people to check out magazines .
Person2:Why not ?
Person1: It ' s just a policy of ours .
Person2:So what am I allowed to check out ?
Person1: You may check out books or videos .
Person2:I need to check out this magazine .
Person1: You will have to just read it in the library .
Person2:That doesn ' t make any sense .

Ex Output:
informal

Ex Input:
Person1: How do you usually sell your products now ?
Person2:I'm doing business through Internet now .
Person1: Oh , really ? Is it a good way ?
Person2:Yes , very good .
Person1: What advantages does it have ?
Person2:It is very convenient . You know you can browse the website and send e-mails to your customers at any time .
Person1: Yes , if we do business through other ways , it will cost a lot of time .
Person2:Also it has low cost , and you know you only need to pay the fee of Internet , which is very cheap .
Person1: Yes , going abroad to join the exhibition will cost much . But does it have any disadvantages ?
Person2:To be frank , sometimes it is not so safe as doing business through traditional ways .
Person1: You mean there may be credit problems ?
Person2:Yes , but if you choose some good B2B websites , such problems can be avoided .
Person1: Will you give some suggestion ?
Person2:Of course , such as the Alabama , which is a famous website .
Person1: Thanks . Maybe I will do business through Internet in the future .

Ex Output:
informal