<rdococ> le//rn ice//I.C.E. stands for Imaginary Christian Era. It covers the forgotten period of time that is not on the linear timeline.

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