public static void printInvertedBits(int input) {
    if (input < 0) return;
    input = -input;
    StringBuilder bits = new StringBuilder();
    for (int i = 0; i < 32; i++) {
        if ((i + 1) % 4 == 1) bits.insert(0, " ");
        bits.insert(0, (input & 1));
        input = input >> 1;
    }
    System.out.println(bits);
}