<tswett> echo \'There is a way out. Finding it will be difficult. It may be the hardest thing you\'\\\'\'ve ever done. Find it anyway.\' > good/544

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