<b_jonas> python3 -cf = "/hackenv/wisdom/ci"; s = open(f).read(); s = s[:-1] + " Shamus Young invented them.\\n"; open(f,"w").write(s); print("%r"%s);

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