public static Node<Integer> what (Node<Integer> lst, int x)
{
    if (lst == null)
        return null;
    Node<Integer> temp = what (lst.getNext(), x);
    if (lst.getValue() == x)
        return temp;
    lst.setNext (temp);
    return lst;
}

public static void guess (Node<Integer> lst)
{
    if (lst != null) {
        Node<Integer> temp = what (lst.getNext(), lst.getValue());
        lst.setNext (temp);
        guess (lst.getNext());
    }
}