(defparameter N (parse-integer (read-line)))
(defparameter kouho '(0 1 2 3 4 5 6 7 8 9 ))

(defparameter x '())
(defparameter yn "Y" )

(loop for line = (read-line nil nil) while line
    do
    (setq line (read-from-string (concatenate 'string "(" line ")" )))
    (setq yn (nth 4 line ))
    (if (eq yn 'YES) (setq kouho (intersection kouho line))
        (setq kouho (set-difference kouho line)))
)
(format 't "~A~%" (car kouho))