#!/usr/bin/env python
# -*- coding: utf-8 -*-
import sys
import codecs
from unicodedata import name
en2el = codecs.open('corpora/en2el.txt', encoding='utf-8', mode='r').readlines()
sys.stdout = codecs.getwriter('utf-8')(sys.stdout)

en2el = [pair.strip().split('\t') for pair in en2el]
special = []

for en, el in en2el:
  enletters = set(en)
  elletters = set(el)
  if not enletters.intersection(elletters):
    special.append(el)    

letters = set(list(''.join(special)))

for letter in  sorted(letters): 
	print letter,