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: Are these your text books ? Biochemistry , General Ecology , Botany , Cell Genetics , Molecular Genetics ...
Person2:Yes . I gotta review all of them for the final exam . It is just around the corner .
Person1: Oh , right ! Do you have many exams at the end of each semester ?
Person2:That depends . Some semesters have many , some don't . And some courses don't have exams but only ask for papers . That's easy .
Person1: And when do you prepare for your final exam ?
Person2:Honestly speaking , most students prepare it one month before the exam .
Person1: Really ? You only review your lessons in one month ? Does it work ?
Person2:Of course , it's useful . And it's very crucial to have the copies of teacher's notes , because most questions in the exam are based on them .
Person1: Wow , and all the key points are included in them ? You're so smart !
Person2:But the exam is not as simple as you may imagine . We have to stay up late .
Person1: Do you have the classrooms open for the whole night ?
Person2:Yes , some people even pack up his bed quilt and sleep there . That's a little bit crazy .

Output: informal

Input: Consider Input: Person1: Hello , IMPF Bank , how can I help you ?
Person2:I need to report a missing Bank Card and Book .
Person1: OK Sir . Could you tell me the account holder's name , the account number , the amount in the account and your PIN number , please ?
Person2:Well , the account's in my name . Patrick Dean , that's D-E-A-N . The account number is 15273478841 . There was about 20,000 RIB inside .
Person1: OK , Sir . Almost there , I just need your PIN number . When we issue you with a new card and book we would recommend that you change your PIN number . It's a very simple procedure .
Person2:OK , it's 672910 .

Output: formal

Input: Consider Input: Person1: Are you ready to go the concert ?
Person2:Yes . Should we go there by bus so we aren't late ?
Person1: Actually , why don't we go there by bike ? We could get stuck in traffic if we travel by bus in rush hour .
Person2:That's true . Cycling is good for our environment , too . Let me just get my helmet then .
Person1: Is your helmet comfortable ?
Person2:Not really , but I liked the design , so I got it .
Person1: Maybe you should think about getting a round helmet ; they're better .
Person2:I'll think about it .
Person1: Is that your new bicycle ?
Person2:Yes , my father gave it to me for my birthday . Do you like it ?
Person1: It's the newest 10 speed cycling mountain bike . These are really expensive !
Person2:Nothing but the best from my dad . I like everything about it except for the brakes . They are a bit sticky .
Person1: I can fix those for you . Is there anything else wrong with it ?
Person2:Well , my saddle is too low for me . Do you know how to change the height ?
Person1: That's easy . It's important to have the saddle high enough so that your legs can extend fully when you are on your bicycle .
Person2:Is that why my knees have felt sore after every time I've ridden my bike ?
Person1: It's possible . Give me a minute and I can fix these for you and then we can go .
Output: informal