(defvar A)
(defvar B)
(setq A (read-line))
(setq B (read-line))
(setq A (concatenate 'list A))
(setq B (concatenate 'list B))
(setq A (sort A #'char>))
(setq B (sort B #'char>))
;(print A)
;(print B)
(if (equal A B) (format 't "YES~%") (format 't "NO~%"))