void specAdd (listNode *&list)
{
    if (list ==  NULL)
        return;

    listNode *wp = list;
    listNode *fol = wp->next;
    int num;

    while (wp != NULL)
    {
        num = (wp->number)*(wp->number);
        listNode *node = new listNode;
        node->next = fol;
        node->number = num;
        node->prev = wp;
        num = 0;
        wp = fol;
        fol = fol->next;
    }
}