What is the error
package com.codegym.task.task18.task1803;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.*;
/*
Most frequent bytes
*/
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String s= reader.readLine();
FileInputStream inputStream = new FileInputStream(s);
ArrayList<Integer> list = new ArrayList<>();
Map<Integer,Integer> map = new HashMap<>();
while(inputStream.available()>0){
int temp = inputStream.read();
list.add(temp);
}
inputStream.close();
int count=0;
for(int i=0;i<list.size();i++){
for(int j=0;j<list.size();j++){
if(list.get(i)==list.get(j)){
count++;
}
}
map.put(list.get(i),count);
count=0;
}
int max=0;
for (Map.Entry<Integer,Integer> entry : map.entrySet()) {
if (entry.getValue() > max) {
max = entry.getValue();
System.out.print(entry.getKey() + "\t");
}
}
}
}