не проходит третий пункт
package com.javarush.task.task18.task1805;
/*
Сортировка байт
*/
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.*;
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String fileName = reader.readLine();
HashSet<Integer> hashSet = new HashSet<>();
ArrayList<Integer> list = new ArrayList<>();
FileInputStream stream = new FileInputStream(fileName);
while (stream.available()>0){
int b=stream.read();
list.add(b);}
stream.close();
int i=0;
Iterator<Integer> iterator = hashSet.iterator();
while (iterator.hasNext()){
Integer integer = iterator.next();
System.out.print(integer);
if (i+1!=hashSet.size()){System.out.print(" ");
i++;}
}
}
}