#!/usr/bin/env python3
# ---------------------------------------------------------------------------- #
## \file uniq.py
## \author Sebastien Beaugrand
## \sa http://beaugrand.chez.com/
## \copyright CeCILL 2.1 Free Software license
# ---------------------------------------------------------------------------- #
import sys
mlist = sys.stdin.read().splitlines()
res = list()
for mel in mlist:
found = False
for str in mlist:
if str.find(mel) != -1 and str != mel:
found = True
break
if not found:
if mel not in res:
res.append(mel)
print(mel)