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: Since China was open to the outside world , its trade forms have become much more flexible . One of these commonly used forms is co-production . Would you please do a bit explanation of it , Mr . Walker ?
Person2:Well , under this arrangement two parties cooperate to manufacture a product or a category of products , for example , machine tools for export . Each party produces and supplies a part of the components and parts ; one party is a Chinese enterprise , the other , an overseas firm . Most probably , the foreign counterpart contributes technology and equipment , and sometimes , parts and components , while the Chinese enterprises factory building , labor and other resources to the cooperative production . They join hands and fulfill orders together by an agreement or a contract .
Person1: I suppose that the assembling of these components and parts , particularly the marketing of the finished products should take place in China .
Person2:Not necessarily . It depends on the contract stipulations . They may be marketed in the foreign country where the other party is located , or even in a third country .
Person1: I think the principle of co-production is to expand export trade . It's a reciprocal business , isn't it ?
Person2:Yes , you are right . Either party is not well-equipped to produce the final products single-handedly , but they can enter into an agreement . In such case , each side contributes different resources to make the manufacture of a certain product or a category of products possible .

Ex Output:
formal

Ex Input:
Person1: What's taking you so long ?
Person2:Don't worry . I'm almost finished .
Person1: I need you to hurry up .
Person2:All right . I'm finished .
Person1: I think there's more you need to do .
Person2:What do you mean by that ?
Person1: My hair looks awful .
Person2:What don't you like about it ?
Person1: I just don't like my hair .
Person2:I'm sorry that you don't like it .
Person1: I won't be paying you for this .
Person2:I'm sure we can work something out .

Ex Output:
informal

Ex Input:
Person1: What's the time now ?
Person2:Sorry , I don't know , there's something wrong with my watch .
Person1: You've simply forgotten to wind it up , have you ? When do you usually wind it up ?
Person2:In the coming , before going to work .
Person1: You got up so late today . You have , I think . Turn on the TV and set your watch by it .
Person2:OK . I'll turn it on .
Person1: All right . It's just four o'clock .
Person2:Well , I'm setting my watch at four . Thank you .
Person1: You are welcome .

Ex Output:
informal