import sys map lambda strip sys argv -1 split set def if not print joi

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