public static int getNode(SinglyLinkedListNode llist, int positionFromTail) {
        int length = getLength(llist);
        int position = (length - 1) - positionFromTail;
        for(int i = 0; i < position; i++){
            llist = llist.next;
        }
        return llist.data;
    }
    
    public static int getLength(SinglyLinkedListNode llist){
        int length = 0;
        while(llist != null){
            length++;
            llist = llist.next;
        }
        return length;
    }