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package com.javarush.task.task19.task1907;
/*
Считаем слово
*/
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.regex.Pattern;
public class Solution {
public static void main(String[] args) throws IOException {
BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
String ff = bf.readLine();
bf.close();
FileReader fr = new FileReader(ff);
bf = new BufferedReader(fr);
int count = 0;
Pattern pattern = Pattern.compile("(\\bworld\\b)");
while (bf.ready()){
String line = bf.readLine();
count += pattern.matcher(line).groupCount();
}
bf.close();
System.out.println(count);
}
}