sedolnum = (c) :
   if ("0" ord <= c ord and c ord <= "9" ord): c number integer.
   else: 10 + c ord - "A" ord.
.

sedol = (str) :
   weight = (1, 3, 1, 7, 3, 9)
   sum = 0
   6 times (i) :
      sum = sum + sedolnum(str(i)) * weight(i)
   .
   (str, (10 - (sum % 10)) % 10) join
.