Array Search

public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);
        String line = scan.nextLine();
        String[] list = line.split(",");
        int[] all = new int[list.length];

        String output = "";

        for (int i = 0; i < list.length; i++) {
            all[i] = Integer.parseInt(list[i]);
        }

        for (int i = 1; i <= all.length; i++) {
            int counter = 0;
            for (int j = 0; j < all.length; j++) {
               if (i != all[j]){
                   counter++;
               }
        } if (counter == all.length){
                output += i + ",";
            }
            }
            System.out.print(output.substring(0, output.length() - 1));
        }
    }