public class Solution {
    public static void main(String[] args) throws IOException {
        //String file = "C:\\JavaRushTasks\\JavaRushTasks\\2.JavaCore\\src\\com\\javarush\\task\\task19\\task1907\\world.txt";
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        String fileName = bufferedReader.readLine();
        bufferedReader.close();

        FileReader reader = new FileReader(fileName);
        BufferedReader bufferedReader1 = new BufferedReader(reader);
        String line;
        int counter = 0;
        while ((line=bufferedReader1.readLine())!=null) {
            String[] array = line.split("\\W");
            for (String s : array) {
                if (s.equals("world")) {
                    counter++;
                    System.out.println(counter);
                }
            }
        }
        System.out.println(counter);
    }
}