import sys map lambda strip sys argv -1 split set def cs if not cs pri

import sys
i = map(lambda x:x.strip(),sys.argv[1][1:-1].split(","))
r,g,s=[],1,set
def b(c,cs):
 if not cs:
  print "[%s]"%", ".join(r)
  sys.exit()
 for n in range(1,g+1):
  for c1 in cs:
   if c1[0].lower() in c[-n:]:
    r.append(c1)
    b(c1,list(s(cs)-s([c1])))
    r.pop()
while 1:
 for c in i:
  r=[c]
  b(c,list(s(i)-s([c])))
 g+=1