#!/usr/bin/env python
# -*- encoding: utf-8 -*-
import re
import sys
import unicodedata
def l(c): m = re.match('(?:U+)?([0-9a-f]{1,4})$', c, re.I); return unicodedata.lookup(c) if m is None else unichr(int(m.group(1),16))
try:
    print u''.join(map(l, sys.argv[1:])).encode('utf-8')
except KeyError:
    print u'Unknown character.'