<\oren\> misle/rn C++/C++ is an attempt to improve upon C. The only thing it actually improved was memory management, and it made everything else worse.

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