<moonythedwarf> le//rn moon//moon is often named the following: moonythedwarf moonythehuman moonheart08 moony moon__ computing and luxon, making porthellos a real pain

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