<oerjan> addquote <Taneb> English is a lie, words lack intrinsic meaning <int-e> fortunately people don\'t operate for long in a vacuum so there\'ll always be context

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