static class FileBufferedReader implements AutoCloseable {
        private char currentSymbol;
        private final InputStreamReader in;
        private static final byte EOF = -1;
        private static final char NEW_LINE = '\n';
        private static final char APOSTROPHE = '\'';

        FileBufferedReader(String fileName) throws IOException {
            in = new InputStreamReader(new FileInputStream(fileName), "utf-8");
        }

        private void readNextChar() throws IOException {
            currentSymbol = (char) in.read();
        }

        boolean hasNext() throws IOException {
            readNextChar();
            return (byte) currentSymbol != EOF;
        }

        boolean thisLine() {
            return currentSymbol != NEW_LINE
                    && (byte) currentSymbol != EOF;
        }

        String nextWord() throws IOException {
            StringBuilder currentWord = new StringBuilder();
            while (!isPunctuation(currentSymbol)) {
                readNextChar();
                if (!thisLine()) {
                    break;
                }
            }
            while (isPunctuation(currentSymbol)) {
                currentWord.append(currentSymbol);
                readNextChar();
            }
            return currentWord.toString().toLowerCase();
        }

        private boolean isPunctuation(char symbol) {
            return Character.isLetter(symbol) || Character.getType(symbol) == Character.DASH_PUNCTUATION
                    || symbol == APOSTROPHE;
        }

        public void close() {
        }
    }