I don't understand why it isn't displaying
package com.codegym.task.task18.task1805;
import java.io.FileInputStream;
import java.util.*;
/*
Sorting bytes
*/
public class Solution {
public static void main(String[] args) throws Exception {
Scanner word = new Scanner(System.in);
String file = word.nextLine();
FileInputStream input = new FileInputStream(file);
HashSet <Integer> set = new HashSet<Integer>();
while (input.available()> 0){
set.add(input.read());
}
input.close();
System.out.println(set);
}
}