old_contents: class Display():
      
      def __init__(self):
          self.start = "Welcome"
          self.draw = "Draw"
          self.computer = "Computer Wins"
          self.human = "You Win"
  
      def show(self, text):
          print text
  
new_contents: class Display():
      
      def __init__(self):
          self.start = "Welcome"
          self.draw = "Draw"
          self.computer = "Computer Wins"
          self.human = "You Win"
          self.next_move = "What is your next move?"
  
      def show(self, text):
          print text
  
subject: add next_move message to display