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 heard that James was fired because he got a keep back of 20 thousands dollars from a vender .
Person2:That ' s open secret .
Person1: But mine could be a lie for his job .
Person2:How did you know that ?
Person1: A little bird whispered to me . Keep that to yourself .

Ex Output:
formal

Ex Input:
Person1: Lucy , where are you going ?
Person2:I want to go to the supermarket .
Person1: Wait a few minutes and I'll go there with you .
Person2:Let's get a shopping cart .
Person1: Good idea
Person2:What are you going to buy ?
Person1: Let's check out the fruit section first .
Person2:OK . I'd like some oranges . But they don't look quite ripe yet .
Person1: Look , nice fresh cherries ! They are ripe and soft . I'll take some .
Person2:I'll take some , too .
Person1: Let's go to the snacks section . I want some chocolate and sweets .
Person2:OK . I'll go and buy some cakes .
Person1: Do you want to buy something else ?
Person2:No . Let's go over to the check-out stand .

Ex Output:
informal

Ex Input:
Person1: Hong , I really need to call back to the UK but I can ' t afford to pay for the roaming charges .
Person2:Well , why don ' t you use a local SIM card ?
Person1: Can I do that ?
Person2:Yes . Just go to the convenience store and ask for a SIM card . Then insert it into your phone .
Person1: I see . How much will that cost ?
Person2:Well it ' s 100 RIB for the SIM card then it will cost you about 10 RIB per minute to call the UK .
Person1: Wow , that is cheap . Thank you very much .

Ex Output:
informal