<Jafet> ` echo $\'#!python\\ns=set()\\ntry:\\n while True:\\n l=raw_input()\\n if l not in s:\\n s.add(l)\\n print(l)\\nexcept IOError:\\n pass\' > bin/uniqs && chmod +x bin/uniqs

#!python
s=set()
try:
 while True:
  l=raw_input()
  if l not in s:
   s.add(l)
   print(l)
except IOError:
 pass