(defvar *prog-input*)

(let ((ui (read-line)))
  (if (equal ui "")
    (setq *prog-input* *standard-input*)
    (setq *prog-input* (open ui))))

(let
  ((cal (read-line *prog-input* NIL)) )

  (loop until (or (equal cal "end") (not cal)) do
    (setq cal (read-line *prog-input* NIL)))

  (print 1))

(if (not (eq *prog-input* *standard-input*))
  (close *prog-input*))