import sys

import codecs

import io

import re

class WordlistParser:

    def __init__(self, stream):

        self.stream = stream

    def parse(self):

        wlist = []

        while True:

            line = self.stream.readline()

            if len(line) == 0:

                break

            line = line.strip()

            wlist.append(line)

        return wlist

class WordformParser:

    BASEVAR_RE = re.compile(u"^(\t)?(.*)$", re.UNICODE)

        self.stream = stream

        self.limit = limit

        self.lineno = 0

        self.cnt = 0

        wlist = []

        while True:

            line = self.stream.readline()

            if len(line) == 0:

                break

            self.lineno += 1

            m = self.BASEVAR_RE.match(line)

            if not m:

                raise Exception("Line {:d}: '{:s}' wrong format\n".format(self.lineno, line))

            tab = m.group(1)

                continue

            self.cnt += 1

            if self.limit and self.cnt > self.limit:

                break

            headword = m.group(2).strip().lower()

            wlist.append(headword)

        return wlist

class FreqlistParser:

    FREQ_RE = re.compile(u"^([0-9]+) (.*)$", re.UNICODE)

    def __init__(self, stream, limit = None):

        self.stream = stream

        self.limit = limit

        self.lineno = 0

    def parse(self):

        wlist = []

        while True:

            if self.limit and self.lineno >= self.limit:

                break

            line = self.stream.readline()

            if len(line) == 0:

                break

            self.lineno += 1

            m = self.FREQ_RE.match(line)

            if not m:

                raise Exception("Line '{:s}' #{:d} is not in NUM WORD format\n".format(line, self.lineno))

            headword = m.group(2).strip().lower()

            wlist.append(headword)

        return wlist

if __name__ == '__main__':

    USAGE = "Usage: PROG  $WORDLIST  [+/-][NUM][b/f]:FREQLIST..."

    if len(sys.argv) < 3:

        raise Exception(USAGE)

    COMMAND_RE = re.compile("([-+])([0-9]+)?([bf]):([^:]+)")

    IN_SET = set()

    EX_SET = set()

    for idx in range(1, len(sys.argv)):

        spec = sys.argv[idx]

        m = COMMAND_RE.match(spec)

        if not m:

            raise Exception("Wrong FREQLIST spec: '{:s}'\n".format(spec) + USAGE)

        fname = m.group(4)

        limit = m.group(2)

        mode = m.group(3)

        if limit:

            limit = int(limit)

        with io.open(fname, mode='r', buffering=1, encoding="utf-8") as stream:

            if mode == "b":

                parser = WordformParser(stream, limit)

            elif mode == "f":

                parser = FreqlistParser(stream, limit)

            else:

                raise Expection("Unknown mode in specification...")

            try:

                wlist = parser.parse()

            except:

                print("Error during processing: {:s}".format(fname))

                raise

        wlist = set([w.lower() for w in wlist])

        if m.group(1) == "+":

            IN_SET |= wlist

        else:

            EX_SET |= wlist

    for headword in IN_SET - EX_SET:

        # if any(c in headword for c in " '."):

        #     continue

        print(headword)