<oerjan> le/rn Hungry//Hungry is a country in Europe, formerly part of the Ostrich empire. It split after a famine that got so severe that they had to start editing disgusting things like bell peppers. Absurdly, this became a tradition that continues until the present day.

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