another approach !

    if (i < 1 || j < 1 || k < 1) return -1;

    int count = 0;

    for (int n = i; n <= j; n++) {
        String wordInt = String.valueOf(n);
        int y = wordInt.length() - 1;
        String reverse = "";

        while (y >= 0) {
            reverse = reverse + wordInt.charAt(y);
            y--;
        }

        int num = Integer.parseInt(reverse);
        int difference = Math.abs(num - n);

        if (difference % k == 0) {
            count++;
        }
    }
    return count;