public static void task19() {
        Scanner scan = new Scanner(System.in);
        int n = Integer.parseInt(scan.nextLine());
        int[][] matrix = new int[n][n];
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < n; j++) {
                matrix[i][j] = scan.nextInt();
            }
        }
        boolean flag = false;
        ArrayList numberOfRows = new ArrayList();
        ArrayList numberOfColumns = new ArrayList();
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < n; j++) {
                if (matrix[i][j] != 0) {
                    flag = false;
                    continue;
                } else flag = true;
            }
            if (flag == true)
                numberOfRows.add(i);
        }
        flag = false;
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < n; j++) {
                if (matrix[j][i] != 0) {
                    flag = false;
                    continue;
                } else flag = true;
            }
            if (flag == true)
                numberOfColumns.add(i);
        }
}