class Solution:
    def deleteMiddle(self, head: Optional[ListNode]) -> Optional[ListNode]:
        if not head.next:
            return None
        
        slow = head
        fast = head.next.next
        
        while fast and fast.next:
            slow = slow.next
            fast = fast.next.next
            
        slow.next = slow.next.next
        
        return head