Alternative solution is not accepted

Hello folks, I solved this question in another way and I tested it many times and each time I get the correct answer, but my Solution doesn't get accepted. Can anybody figure out why?

public class Solution {
    public static void main(String[] args) throws IOException {
        //write your code here
        Scanner scanner = new Scanner(System.in);
        ArrayList<Integer> list = new ArrayList<>();

        for (int i = 0; i < 10; i++) {
            int input = scanner.nextInt();
            list.add(input);

        }

        Collections.sort(list);
        int longest = 0;
        int result = 1;
        for (int i = 0; i < list.size() - 1; i++) {
            if (list.get(i + 1) == list.get(i)) {
                longest++;
                result = Math.max(result, longest);
            } else {
                longest = 0;
            }
        }

        System.out.println(result + 1);

    }
}