Подскажите, почему не проходит валидацию

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;

/*
Считаем слово
*/

public class Solution {
    public static void main(String[] args) throws IOException {


        BufferedReader fileName = new BufferedReader(new InputStreamReader(System.in));

        String address = fileName.readLine();
        fileName.close();
        FileReader file = new FileReader(address);

        String str = "";
        int count = 0;

        while (file.ready()){
            char a = (char) file.read();
            String b = String.valueOf(a);

            if (!b.equals(",")) {
                str = str+a;
            }

            else {
                str = str.toLowerCase();
                if(str.equals("world")){
                    count++;
                }
                str = "";

            }
        }

        file.close();
        System.out.println(count);



    }
}