new_contents: class GostTrack:
  
      def __init__(self):
          self.list_size = 0
          self.current_pos = 0
          self.pos_list = []
  
      def add_pos(self, ang, rad):
          self.list_size += 1
          self.pos_list.append((ang, rad))
  
      def get_next_pos(self):
          if self.list_size == self.list_size:
              self.current_pos += 1
          return self.pos_list[self.current_pos-1];
  
      def reset_count(self):
          self.current_pos = 0;
  
  
  if __name__ == '__main__':
      h = GostTrack()
      h.add_pos(20, 30)
      h.add_pos(34, 76)
      print(h.get_next_pos())
      print(h.get_next_pos())
      h.reset_count()
      print(h.get_next_pos())
      print(h.get_next_pos())
  
subject: Add GostTrack implementation