Instructions: 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: Person1: What do you think is the role teacher should play in the classroom ?
Person2:Teachers are just directors who give scope to the students ' initiative and creativeness , instead of taking their rights away from speaking .
Person1: What did you do to put it into practice ?
Person2:I divided students into groups and asked them to generate their own ideas actively . It can help develop the problem-solving ability of the students .
Output:
formal