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    1. # Definition for singly-linked list.
    2. # class ListNode:
    3. #     def __init__(self, x):
    4. #         self.val = x
    5. #         self.next = None
    7. class Solution:
    8.     def deleteDuplicates(self, head: ListNode) -> ListNode:
    9.         node=head
    10.         while node and node.next:
    11.             if node.val==node.next.val:
    12.                 node.next=node.next.next
    13.             else:
    14.                 node=node.next
    15.         return head