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'.

Input: Consider Input: Person1: So how's everything going for Christmas ?
Person2:I've got all the presents I need , and my family is working together to get all the food ready . That's easy , but I have another problem to deal with .
Person1: What's that ? Don't tell me you've still got Christmas cards to write , it usually takes my wife a month to write all of ours .
Person2:No , I did that a long time ago . It's about telling my son the truth about Santa Claus .
Person1: He still doesn't know that Santa isn't real ? How old is he , eight ?
Person2:Yes . He's never said anything so I never told him . But now that he's getting older ...
Person1: You think it's better that he should be told ?
Person2:Yes , he's too old to believe in that type of things . And I'd rather tell him before the kids at school do .
Person1: That happened to my oldest girl . She became really upset when her classmates told her Santa wasn't real .
Person2:I can understand . I was lucky with my oldest , she figured it out by herself and didn't tell my son .
Person1: Well , when you tell him , be gentle . It's hard for kids to find out something like that .

Output: informal

Input: Consider Input: Person1: I know that you are interested in our washers .
Person2:Yes , we are thinking of placing an order . However we would like to know what kinds of machines are available for export and in addition your sales terms , including mode of payment , discount and possible date of delivery .
Person1: We supply washers of all types and sizes . We have years of experience in the manufacture of washers .
Person2:We have read about this in your sales literature . Could you give us some idea of your prices ?
Person1: Our prices compare favorably with those offered by other manufactures either in Europe or anywhere else . Here are our latest price lists . You will see that our prices are very attractive .
Person2:Do you take special orders ? That is , do you make machines according to the specific requirements from clients ?
Person1: Sure , we do .
Person2:How long does it usually take you to make delivery ?
Person1: As a rule , we deliver all our orders within three months after receipt of relevant L / C . It takes longer , of course , for special orders . In no case would it take longer than six months .
Person2:Good . One more thing , we'd like you to quote us on CIF basis .
Person1: Okay . No problem .

Output: formal

Input: Consider Input: Person1: I cannot understand why she always helps and supports her brother .
Person2:Why do you say so ?
Person1: Because he is often in trouble .
Person2:She has promised her mother that she would be with him through thick and thin .
Person1: Oh , I see .
Output: formal