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package com.javarush.task.task19.task1907;
/*
Считаем слово
*/ import java.io.*;
public class Solution {
public static void main(String[] args)throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
FileReader fileReader = new FileReader(reader.readLine());
reader.close();
StringBuilder stringBuilder = new StringBuilder();
while (fileReader.ready()){
stringBuilder.append((char) fileReader.read());
}
fileReader.close();
int count = 0;
String[] arr = stringBuilder.toString().split(",");
for (String s: arr) if ("world".equals(s)) count++;
System.out.println(count);
}
}