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: Nurse , I am sure to die soon . They just don't tell me the truth , I know .
Person2:But I don't think so . No one has ever said a word that you are to die , only yourself . That means you are not willing to die , right ? Actually , you are recovering and what you imagine as your worry is slowing down the treatment . Many cases worse than yours turned out to be hopeful and successful . You must be confident . Your condition is much better physically , but a little bi difficult mentally . The most important thing for you now is cooperation with us .
Person1: Is what you said really true ?
Person2:Of course . I am a nurse and a nurse tells the truth .
Person1: Thank you .

Output: formal

Input: Consider Input: Person1: isn't it wonderful walking here ?
Person2:what do you mean ?
Person1: I mean look at all these magnificent tall buildings around us .
Person2:yes , look over there . That's the Empire State Building . My book says it's 102 stories tall .
Person1: it's quite famous but don't you think it looks a bit old-fashioned ?
Person2:you're right , but when it was built in 1930 it was a marvel of technology and engineering .
Person1: what other important buildings are we going to see on Fifth Avenue ?
Person2:quite a number . Actually every skyscraper has a history . A few blocks ahead we'll see St.Patrick ' s Cathedral and just across the street will be the world-renowed Rockefeller Center . It's a landmark
Person1: what's there after that ?
Person2:well then , there's a Central Park . Facing the park on Fifth Avenue is probably some of the most expensive properties in the world .
Person1: what are all they for ?
Person2:most of them are office buildings , huge department stores , and hotels but some are just private homes . New York is one of the financial centers of the words so there are lots of very expensive places .
Output: informal