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:     Are the galaxies in the universe moving through space ? 
 Person2:  No , the galaxies sit more or less passively in the space around them . But not too much . As the space between galaxies expands , it carries the galaxies further apart - like raisins in an expanding dough . 
 Person1:      But I heard that our Milky way galaxy may one day collide with a neighboring galaxy . If galaxies are moving apart from each other , how can they collide ? 
 Person2:  Well , the universe is a chaotic place , and the gravity from one galaxy , or from a group of galaxies , may disturb the motion of its near neighbors , causing them to collide . However , on average , when you compare two large enough chunks of space , the galaxies in one are moving away from the galaxies in the other . 
 Person1:      Wow , you're really informative . Thanks a lot . 
 Person2:  You're welcome . 

1