lowercase = (str) :
   low = ("")
   str length times (i) :
      low append(if (65 <= str(i) ord and str(i) ord <= 90) :
         "abcdefghijklmnopqrstuvwxyz"(str(i) ord - 65)
      . else :
         str(i)
      .)
   .
   low join("")
.
uppercase = (str) :
   upp = ("")
   str length times (i) :
      upp append(if (97 <= str(i) ord and str(i) ord <= 122) :
         "ABCDEFGHIJKLMNOPQRSTUVWXYZ"(str(i) ord - 97)
      . else :
         str(i)
      .)
   .
   upp join("")
.

lowercase("alphaBETA") print
uppercase("alphaBETA") print