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:     Hi , Bill . Are you going to the commencement ?  
 Person2:  Yes . Do you want to go with me ?  
 Person1:      OK . ( Several minutes later . ) Let's go into the school auditorium .  
 Person2:  Now that take this seat . Do you see those piles of red diplomas on the desks on the stage ?  
 Person1:      Yes . I find my heart is now rising and falling like waves , all sorts of feelings welling up in my heart .  
 Person2:  That's true . Four years ' trails and hardships , joys and sorrows of life are gushing out to my mind all together . I can hardly tell whether I am joyful or gloomy at the moment when I am about to leave the campus and to start a new stage of my life .  
 Person1:      How time flies . Look , the president of the college has come onto the stage .  
 Person2:  He's going to make the opening speech . 

1