<b_jonas> le/rn_append california//. WARNING: The area of California is made of chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

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