class FastScanner(f: File) {
    var br = BufferedReader(FileReader(f))
    var str = ""
    var st = StringTokenizer(str)

    operator fun next(): String {
        while (!st.hasMoreTokens()) {
            str = br.readLine()
            st = StringTokenizer(str)
        }
        return st.nextToken()
    }

    fun nextInt(): Int {
        return Integer.parseInt(next())
    }
}