Remove Duplicates from Sorted List

1# Definition for singly-linked list.
2# class ListNode:
3#     def __init__(self, val=0, next=None):
4#         self.val = val
5#         self.next = next
6class Solution:
7    def deleteDuplicates(self, head: Optional[ListNode]) -> Optional[ListNode]:
8        result = head
9        cur = head
10        while cur is not None:
11            if cur.next is not None:
12                if cur.next.val == cur.val:
13                    cur.next = cur.next.next
14                else:
15                    cur = cur.next
16            else:
17                cur = cur.next
18        
19        return result