class DrinksMachineE extends DrinksMachineA
{
// A version of DrinksMachineA with an extra button

 public DrinksMachineE(int p)
 {
  super(p);
 }

 public String pressSprite()
 {
  if(balance<price)
     return "Nothing";
  else
     {
      int change=balance-price;
      balance=0;
      return "Sprite + "+change+"p";
     }
 }

}