Definition: You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. If the conversation begins with a question, label it '1' otherwise '0'.
Input:  Person1:     What's that ?  
 Person2:  It's a surprise !  
 Person1:      For me ?  
 Person2:  Yes . Let's go inside and you can open it up .  
 Person1:      Wow ! It's big ! What could it be ?  
 Person2:  I'll give you two clues . First , it cost more than $ 250 . And second , it's not big , but fat .  
 Person1:      What does that mean , not big but fat ? You didn't buy ... 

1