return super.getMessage() + (index >= 0 ? " at index " + index : "") + ": " + input;
return (super.getMessage() + (index >= 0 ? " at index " + index : "") + ": " + input);
  public String getMessage()  {    return super.getMessage() + (index >= 0 ? " at index " + index : "")      + ": " + input;  }