/
package com.javarush.task.task19.task1907;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class Solution {
private static String fileName = "";
public static void main(String[] args) {
int countOfWorld = 0;
try (BufferedReader console = new BufferedReader(new InputStreamReader(System.in))) {
fileName = console.readLine();
} catch (IOException _) {}
try (FileReader reader = new FileReader(fileName)) {
while (reader.ready()) {
if (reader.read() == 'w' &&
reader.read() == 'o' &&
reader.read() == 'r' &&
reader.read() == 'l' &&
reader.read() == 'd') {
countOfWorld++;
}
}
} catch (IOException _) {}
System.out.println(countOfWorld);
}
}