Не понимаю почему не принимает.

ArrayList<Integer> dataList = new ArrayList<>();
            while (reader.available() > 0) {
                dataList.add(reader.read());
            }
            HashMap<Integer, ArrayList<Integer>> frequencies = new HashMap<>();
            for (Integer value : dataList){
                int count = Collections.frequency(dataList, value);
                ArrayList<Integer> list;
                if (!frequencies.containsKey(count)){
                    list = new ArrayList<>();
                } else {
                    list = frequencies.get(count);
                }
                list.add(value);
                frequencies.put(count,list);
            }
            int minKey = Collections.min(frequencies.keySet());
            ArrayList<Integer> resultList = frequencies.get(minKey);
            for (Integer value : resultList){
                System.out.print(value + " ");
            }

public class Solution {
    public static void main(String[] args) throws Exception {
        try (BufferedReader console = new BufferedReader(new InputStreamReader(System.in));
             FileInputStream reader = new FileInputStream(console.readLine())) {

            ArrayList<Integer> dataList = new ArrayList<>();
            while (reader.available() > 0) {
                dataList.add(reader.read());
            }
            List<Integer> copyList = new ArrayList<>();
            int min = Integer.MAX_VALUE;

            for (int i = 0; i < dataList.size(); i++) {

                int count = Collections.frequency(dataList, dataList.get(i));

                if (count < min ){
                    min = count;
                    copyList.clear();
                    copyList.add(dataList.get(i));
                }else if (count == min){
                    copyList.add(dataList.get(i));

                }
            }
            copyList.stream().forEach( x -> System.out.print(x + " "));

HashSet<Integer> resultSet = new HashSet<>(resultList);

minFrequency = frequency;

ArrayList<Integer> dataListCopy = new ArrayList<>(dataList.size());
            ArrayList<Integer> outputList = new ArrayList<>(dataList.size());
            for (Integer value : dataList) {
                dataListCopy.add(value);
                outputList.add(value);
            }

            int minFrequency = Integer.MAX_VALUE;
            for (int a = 0; a < dataList.size(); a++) {
                int frequency = Collections.frequency(dataListCopy, dataList.get(a));
                if (frequency < minFrequency) {
                    minFrequency = frequency;
                }
                if (frequency > minFrequency) {
                    for (int b = a; b >= 0; b-- ){
                        if (dataListCopy.get(b) == dataListCopy.get(a)){
                            outputList.set(b, 0);
                        }
                    }
                    outputList.set(a, 0);
                }
            }
            for (Integer number : outputList){
                if (number != 0){
                    System.out.print(number + " ");
                }
            }
        }
    }
}

public class Solution {
    public static void main(String[] args) throws Exception {
        HashMap<Integer, Integer> bytes = new HashMap<>();
        try (BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
             FileInputStream fileInputStream = new FileInputStream(reader.readLine())) {

            while (fileInputStream.available() > 0) {
                bytes.merge(fileInputStream.read(), 1, Integer::sum);
            }
            bytes.entrySet().stream()
                    .filter(x-> x.getValue().equals(Collections.max(bytes.values())))
                    .forEach(x->System.out.print(x.getKey() + " "));
        }
    }
}