Все условия выполнены, но валидатор не принимает по третьему

package com.javarush.task.task18.task1825; import java.io.*; import java.util.*; /* Собираем файл */ public class Solution { public static void main(String[] args) throws IOException { ArrayList<String> list = new ArrayList<>(); Scanner scanner = new Scanner(System.in); String string; while (!(string = scanner.nextLine()).equals("end")) { list.add(string); } Map<Integer, String > map = new TreeMap<>(); int lastIndex = list.get(0).indexOf("part"); for (int i = 0; i < list.size(); i++) { String s = list.get(i); String partStr = s.substring(lastIndex + 4); int part = Integer.parseInt(partStr); map.put(part, s); } String fullName = list.get(0).substring(0, lastIndex-1); // System.out.println(fullName); BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(new File(fullName), true)); Set set = map.entrySet(); for (Object o : set) { Map.Entry m = (Map.Entry) o; BufferedInputStream bufferedInputStream = new BufferedInputStream(new FileInputStream(new File((String) m.getValue()))); byte[] bytes = new byte[bufferedInputStream.available()]; bufferedInputStream.read(bytes); bufferedOutputStream.write(bytes); bufferedInputStream.close(); } bufferedOutputStream.close(); } }