void duplicare(int n, int &d)
{
    d = 0;
    int p = 1, copie = n;
    while(n)
    {
        int c = n % 10;
        if(c % 2 == 0)
        {
            d = d + c * p;
            p = p * 10;
            d = d + c * p;
        }
        else
            d = d + c * p;
        p = p * 10;
        n = n / 10;
    }
    if(d == copie)
        d = -1;
}