<hppavilion[1]> le/rn Russell\'s Teapot//Russell\'s little Teapot / Short and stout / Orbits near Mars / Or thereabout. / If you see it / Let us know / If you don\'t / What does that show?

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