(define (solve a1 a2 a3)
  (cond [(even? (+ a1 a2 a3)) ":-)"]
        [else ":-("]))

(define (main args)
  (let* ([a1 (read)]
         [_ (read)]
         [a2 (read)]
         [_ (read)]
         [a3 (read)])
    (print (solve a1 a2 a3)))
  0)