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import java.lang.*;
import java.util.*;
import node.*;
class ReverseList {
public static ListNode reverseList(ListNode head) {
ListNode prev = null;
ListNode node = head;
while (node != null) {
ListNode tmp = node.next;
node.next = prev;
prev = node;
node = tmp;
}
return prev;
}
public static void main(String[] args) {
ListNode fourth = new ListNode(5, null);
ListNode third = new ListNode(4, fourth);
ListNode second = new ListNode(3, third);
ListNode first = new ListNode(2, second);
ListNode head = new ListNode(1, first);
ListNode curr = reverseList(head);
while (curr != null) {
System.out.println(curr.val);
curr = curr.next;
}
}
}
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