#include <iostream>
#include <fstream>
#include <iterator>
#include <algorithm>
#include <set>
#include <cctype>
using namespace std;

set<string> dict;

string clean(const string &s) {
    string res;
    for (char c : s)
        if (isalpha(c) || (c == '\''))
            res += (char)tolower(c);
    return res;
}

void check(const string & s) {
    string cleanword = clean(s);
    if (! dict.count(cleanword) )
        cout << s << endl;
}

int main(int argc, char **argv) {
    ifstream fin(argv[1]);
    if (!fin) {
        cerr << "No file " << argv[1] << endl;
        return -1;
    }

    typedef istream_iterator<string> string_iterator_over;

    vector<string> dv;
    ifstream dictin("/usr/share/dict/words");
    for_each(string_iterator_over(dictin), string_iterator_over(),
            [&dv] (const string &s) {  dv.push_back(s); } );
    dictin.close();

    dict = set<string>(begin(dv), end(dv));

    for_each(string_iterator_over(fin), string_iterator_over(), check);
}