function getNode(llist, positionFromTail) {
    let data;
    let curr = llist
    for(let i = 0;i<positionFromTail;i++){
        curr = curr.next;
    }
    if(curr.next){
        llist = llist.next
        while(curr.next){
            data = llist.data;
            curr = curr.next;
            llist = llist.next
        }
        return data
    }
    return llist.data
}