#!/usr/bin/env python
# coding: utf-8
import sys
sys.path.append('/home/user')
import codecs

lexfile = sys.argv[1]
id2en = open(lexfile).read().decode('utf-8').splitlines()

id2en = dict([line.split('\t') for line in id2en])

idvocab = set()
envocab = set()

for i, e in id2en.items():
 for iword in i.split(): idvocab.add(iword)
 for eword in e.split(): envocab.add(eword) 

for i in sorted(idvocab): print i