class InputReader{

    public InputReader(InputStream stream){
        reader = new BufferedReader(new InputStreamReader(stream));
        tokenizer=null;
    }

    public String next(){
        while(tokenizer==null || !tokenizer.hasMoreTokens()){
            try {
                tokenizer = new StringTokenizer(reader.readLine());
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }

        return tokenizer.nextToken();
    }

    public int nextInt(){
        return Integer.parseInt(next());
    }

    StringTokenizer tokenizer;
    BufferedReader reader;
}