<oerjan> learn \xc5\x93rjan is oerjan and \xc3\xb8rjan\'s superhero third cousin (once removed) from Qu\xc3\xa9bec. he got his cheesy powers by falling into a giant poutine bowl.

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