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import java.util.Stack;

public class PlusOneLinkedList {

public ListNode plusOne(ListNode head) {

if (head == null) {

return head;

}

Stack<ListNode> stack = new Stack<ListNode>();

for (ListNode node = head; node != null; node = node.next) {

stack.push(node);

}

int k = 1;

while (!stack.isEmpty()) {

ListNode node = stack.pop();

int val = node.val + k;

node.val = val % 10;

k = val / 10;

if (k == 0) {

return head;

}

}

ListNode node = new ListNode(k);

node.next = head;

return node;

}

}