.lower-alpha-li {
    list-style-type: lower-alpha;
}

.bracket-num-li {
    counter-reset: brakets_num_li;
}

.bracket-num-li > li {
    list-style: none;
}

.bracket-num-li > li:before {
    position: absolute;
    left: 10px;

    content: "("counter(brakets_num_li) ")";
    counter-increment: brakets_num_li;
}