import java.util.LinkedList;

public class Node {

public int val;

public Node next;

public Node() {}

public Node(int _val) {

val = _val;

}

public Node(int _val, Node _next) {

val = _val;

next = _next;

}

public static Node numsToNode(int[] nums) {

Node dummy = new Node(-1);

Node curr = dummy;

for(int n: nums) {

curr.next = new Node(n);

curr = curr.next;

}

return dummy.next;

}

public static LinkedList nodeToLinkedList(Node head) {

LinkedList<Integer> res = new LinkedList<>();

while ((head!=null)) {

res.add(head.val);

head = head.next;

}

return res;

}

}