//name:     date:   
   import java.text.DecimalFormat;
   public class SmartCard_shell
   {
      public static void main(String[] args) 
      {
         Station downtown = new Station("Downtown", 1);
         Station center = new Station("Center City", 1);
         Station uptown = new Station("Uptown", 2);
         Station suburbia = new Station("Suburb", 4);
        
         SmartCard jimmy = new SmartCard(20.00); //bought with $20.00 
         jimmy.board(center);            		    //boarded in zone 1
         jimmy.disembark(suburbia);					 //disembark in zone 4
         jimmy.disembark(uptown);					 //disembark without having boarded
      	
      	//lots more test cases!				
      }
   }
   class SmartCard 
   {
      
   }
   class Station
   {
      String stationName;
      int zone;
      public Station(String name, int zone)
      {
        
         this.zone = zone;
      }
      public int getZone()
      {
        
      }
      public String getName()
      {
        
      }
      public String toString()
      {
         return stationName;
      }
      
   }