inline bool isHappy(int &num) {

    a[1] = num / 10000000;
    a[2] = (num / 1000000) - a[1] * 10;
    a[3] = (num / 100000) - (a[1] * 100 + a[2] * 10);
    a[4] = (num / 10000) - (a[1] * 1000 + a[2] * 100 + a[3] * 10);
    a[5] = (num / 1000) - (a[1] * 10000 + a[2] * 1000 + a[3] * 100 + a[4] * 10);
    a[6] = (num / 100) - (a[1] * 100000 + a[2] * 10000 + a[3] * 1000 + a[4] * 100 + a[5] * 10);
    a[7] = (num / 10) - (a[1] * 1000000 + a[2] * 100000 + a[3] * 10000 + a[4] * 1000 + a[5] * 100 + a[6] * 10);
    a[8] = num - (a[1] * 10000000 + a[2] * 1000000 + a[3] * 100000 + a[4] * 10000 + a[5] * 1000 + a[6] * 100 + a[7] * 10);

    return a[1] + a[2] + a[3] + a[4] == a[5] + a[6] + a[7] + a[8];
}