anarchy golf - the source code

comma format by croyal

while 1:
 s=raw_input()[::-1]
 r=''
 for i,c in enumerate(s):
  if i>0 and i%3==0:r+=','
  r+=c
 print r[::-1]

Note that non-ascii characters in the above source code will be escaped (such as \x9f).