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: Finally the class is over . Be quick . Ben must have been waiting for long .
Person2:Oh , I am so tired . My back is sore and my neck hurts .
Person1: That's normal . You have been sitting for three hours , with your attention highly concentrated .
Person2:You are wrong , Shirley . I was always absent-minded in the class . I meant to concentrate on the class , but I was just so tired . Maybe I am old .
Person1: No . You are just burning yourself out these days . Have a good rest and you will feel energetic again .
Person2:One of my friends took the Adult College Entrance Exam last year . He filled the school column with his name , and his score was relinquished .
Person1: How could he make such a silly mistake ?
Person2:He said he hadn't taken any exams for ten years , and couldn't get used to it immediately . He was extremely nervous then .
Person1: He lost a very good chance to go to college , didn't he ?
Person2:Yeah . The test was fairly easy and almost every test-taker could pass that exam . Adult College Entrance Exam is much easier than college entrance exam . And there are fewer subjects .
Person1: That's a very good lesson . We must familiarize ourselves with the exam from now on .

Output: formal

Input: Consider Input: Person1: Ma , I really don't know how to thank you .
Person2:I'm glad I was able to help .
Person1: It's most kind of you .
Person2:Don't mention it . It was the least I could do .
Person1: If there's ever anything I can do for you , Don't hesitate to let me know .
Person2:Thank you .
Person1: I'm most grateful .
Person2:It was a pleasure .

Output: informal

Input: Consider Input: Person1: Hello everyone ! I ' m Rick Fields , and here with me is Bob Copeland .
Person2:Howdy folks , and welcome to today ' s game ! You know , Rick , today is a key game between Russia and Canada . As you know , the winner will move on to the finals .
Person1: That ' s right , and it looks like we ' re just about ready to start the match . The ref is calling the players for the face-off ... and here we go ! The Russians win possession and immediately set up their attack ! Federal gets checked hard into the boards !
Person2:Maurice Richard has the puck now , and passes it to the center . He shoots ! Wow what a save by the goalie !
Person1: Alright , the puck is back in play now . Pavel Bure is on a breakaway ! He is flying down the ice ! The defenders can ' t keep up ! Slap shot ! He scores .
Person2:What an amazing goal !
Output: informal