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'.

Example Input: Person1: This is the good life ! We have it good don ' t you think ?
Person2:Yeah of course ! Although , don ' t you ever wonder what " could have been " ?
Person1: What do you mean ?
Person2:Well , sometimes I think of how things could have turned out if I had done things a little differently .
Person1: For example ?
Person2:Like for example , if I hadn ' t studied architecture , I would have become an artist like I wanted to .
Person1: I see . Yeah now that I think of it , I wouldn ' t have gotten married if I hadn ' t moved to this town and met Sally .
Person2:You see ! Everything happens for a reason ! We wouldn ' t even have met if I hadn ' t been in that car accident ten years ago !
Person1: Well , I have no regrets !
Person2:I ' ll drink to that !
Example Output: informal

Example 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 .
Example Output: informal

Example Input: Person1: Hey , Tom , what to go for a run ?
Person2:No thanks . I like to run in the morning . I ran a couple of miles when I woke up today .
Person1: I try to do that , but I can ' t get up early enough .
Person2:I couldn ' t either at first , but you get used to it .
Person1: It ' s so hot at lunchtime ; I ' d rather run in the morning .
Person2:Well , why don ' t you come tomorrow ? I ' ll stop by your house on my way out .
Person1: I could try , but I can ' t say for sure if I ' ll get up in time . What time do you want to go ?
Person2:I ' ll give you a call around 6 o'clock and stop by around 6 thirty .
Person1: O . K . , maybe if I have someone to go with , I ' ll be able to get up in time for a jog .
Person2:Great , I ' ll see you then .
Person1: See you .
Example Output:
formal