You will be given a definition of a task first, then some input of the task.
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'.

Person1: You did well on the math test .
Person2:Of course .
Person1: Don ' t you always fail in the math tests ?
Person2:Things were different this time . I sat by a math genius .
Person1: Huh ? You mean you snuck a peek at his test ?
Person2:B :: Come on ! I just took a glance .
Person1: Are you crazy ? You were cheating .
Output:
informal