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: I haven ' t met Bob for years . How is he ?
Person2:He has been keeping bach after divorce .
Person1: He would have recovered from the stress and got married again .
Person2:Once bitten , twice shy . He said he would rather keep bach than to live in disgust .

Ex Output:
formal

Ex Input:
Person1: What have you been up to , Johnny ?
Person2:You know-sweeping , scrubbing , washing , drying , waxing , polishing ...
Person1: Wow , your grandma's really having a field day with you , huh ?
Person2:You got that right ... and my mom's still mad about what we did with the dishes .
Person1: You have all the fun , don't you ?
Person2:Listen , I'd better get back to the grindstone .
Person1: Sure thing , Johnny . Watch out for dishpan hands there , kid !

Ex Output:
formal

Ex Input:
Person1: Let's start to study how to use computers , Paubler.It ' s good to know that a computer has two major parts , the hardware and the software .
Person2:What's the hardware ?
Person1: The hardware of computer is basically all the concrete things you can touch with your hands and see with your eyes .
Person2:That's seems obvious enough.then what about the software ?
Person1: The software of computer is all the programmes inside the computer that allow you to use the computer to do things .
Person2:I see , actually the hardware is the easy part , I do want to study how to use the software .
Person1: Right you are , Paler , and since what you want to learn is how to use software , we should also learn to refer to the computer menus .
Person2:Ever since I saw computer can do your project , I wanted to have a computer .

Ex Output:
formal