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hex added by wasamasa on Thu Dec 29 15:37:28 2016

(define (hex a r g b)
  (string-append
   (if (< a 16)
       (format "0~x" a)
       (format "~x" a))
   (if (< r 16)
       (format "0~x" r)
       (format "~x" r))
   (if (< g 16)
       (format "0~x" g)
       (format "~x" g))
   (if (< b 16)
       (format "0~x" b)
       (format "~x" b))))
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Which procedure returns the number of elements in a list?
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