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: Fred , can you tell me how I can open my QQ Zone ?
Person2:Click your right key of mouse and choose QQ Zone .
Person1: Well , I have to provide some of my information , right ?
Person2:Yep ! The nick name for your zone , address , gender and so on . Some of them are privacy , so you have the right to keep secret here .
Person1: All information is filled in and now I can design my zone .
Person2:You can choose one type to make it as your background , and then find a music player and put your favorite songs into it , so your visitors can enjoy the music after entering into your zone .
Person1: Now everything is OK . I can write my blog , right ?
Person2:Certainly .
Person1: ( Half an hour , Janice begins shouting excitedly . ) What's the matter with you ?
Person2:Look ! David gives his following-comment on my first blog . He is my first visitor .

Ex Output:
informal

Ex Input:
Person1: I'm reading an interesting report on Mars .
Person2:Oh , what does it say ? Does it say water could still exist under the surface of Mars ?
Person1: Absolutely ! It says there is water on Mars buried beneath the surface . It's just a matter of how deep it is .
Person2:Then could the soil on Mars somehow be fertile enough to Groh simple plants ?
Person1: The soil would need quite a bit of fertilizer to grow anything . And it would need to be protected from the UV radiation .
Person2:Actually , we are doing a project in school that involves landing a ship and staying on Mars for an extended period of time . Does NASA have any type of portable habitats that could be used to stay on the planet ?
Person1: I'm not sure NASA has built any portable habitats for extended stays on Mars , but they have looked at various designs .
Person2:One of the most exciting things about Mars is that there could have bean life on it . What are your personal opinions on the life on Mars theory ?
Person1: Well , I'm not really an expert in this area , but my understanding is that anything is possible . It's just that it is so hard to determine what went on 4.5 billion years ago .
Person2:But maybe there is a chance of gradually improving the surface and atmosphere of Mars so it may be inhabitable by humans .
Person1: I'm skeptical . Mars is made of rocks containing silicon , iron , and various minerals . It also has an atmosphere of carbon dioxide . It is so different from what we have on earth , you know .
Person2:I'd still like to hope that some day we could set up a human colony there .
Person1: But there are still other big problems we need to solve such as prolonged weightlessness , food storage , and a series of physiological effects .

Ex Output:
formal

Ex Input:
Person1: I booked a double room for tonight . My name is Ruth Joy .
Person2:Just a moment , please , while I check . That's correct.You have a double room on the fifth floor .

Ex Output:
informal