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 the matter with you , then ? You look miserable .  
 Person2:  It's us .  
 Person1:      What do you mean by us ?  
 Person2:  Well , we used to talk to each other before we were married.Remember ?  
 Person1:      What do you mean ? We're talking now , aren't we ?  
 Person2:  Oh , yes , but we used to do so much together .  
 Person1:      Yes . I remember.But we never used to argue.You used to think I was wonderful.Where are you going ?  
 Person2:  Back to live with my parents.That ' s something else I used to do before we were married.Remember ? 

1