<shachaf> addquote <int-e> fungot is here <fungot> int-e: may cause extreme loss of appetite! may cause severe diarrhea and vomiting!

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