function getNode(llist, positionFromTail) {

    let counter = 0;
    let flag = false;
    let res = null;
    function recur(llist,positionFromTail,flag){
        if(llist && !flag){
            recur(llist.next,positionFromTail,flag)
            counter += 1;
            if(counter == positionFromTail+1) {
                res = llist.data;
                flag = true;
            }
        } 
    }
    recur(llist,positionFromTail)
    return res;

}