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: Can I help you ?
Person2:Yes , I'm looking for a house .
Person1: To buy or to rent ?
Person2:Oh , to rent .
Person1: How much do you want to pay ?
Person2:About 300 a month .
Person1: Well , I've got one here . It's 260 a month .
Person2:How big is it ?
Person1: It's got a kitchen , a bathroom , and one bedroom .
Person2:Well , actually I prefer something a bit bigger if that's possible .
Person1: Yes , I think so . There is also an interesting one.It ' s opposite the park .
Person2:How much is it ?
Person1: It's 325 a month . It's the biggest we've got in this area .
Person2:What's it like ?
Person1: Well , There're two bedrooms , a sitting room , a kitchen and a bathroom .
Person2:It sounds interesting . Can I go and see it ?
Person1: Of course , Sir .

Ex Output:
informal

Ex Input:
Person1: It's said you will go abroad to pursue your graduate studies .
Person2:Yes , I've been thinking about visiting you . I hope to get some advice from you .
Person1: Which country do you want to go to ?
Person2:My field is electronic engineering . Which country do you think I should go ?
Person1: Were I in your position , I'd go to America .
Person2:Which university should I apply to ?
Person1: There are many universities for you to choose from . Some famous universities such as Harvard , Yale , the University of Michigan , and Massachusetts Institute of Technology are really wonderful places to study , but they are very competitive and expensive . Some smaller universities or institutes are also very nice but much cheaper .
Person2:Oh , I see . Thank you very much .

Ex Output:
formal

Ex Input:
Person1: If you go out recently you will find some people riding scooters in high streets and back lanes .
Person2:Yes . The German engineer would never dreamed that the hand - supported scooter he invented several years ago to solve his traffic problems would become so fashionable in the Occident within a few years and even spread to Japan and China .
Person1: Looking at the ' five sense organs ' of a scooter , it can be said as delicate and agile . To pull the T-shaped pole and make it vertical with the flat board and then pull it vertically , adjust its height suitable to you and you may use it .
Person2:Small and exquisite in size , easy to operate , foldable and easy to carry are its charms .
Person1: Your two hands hold the pole , stand on the board , the other foot steps back against the ground and controls well the balance of the body , then you can ride in the air . It has a feeling of surfing . You need not let other people teach you . Your fear will disappear quickly .

Ex Output:
informal