new_contents: # Definition for singly-linked list.
  # class ListNode(object):
  #     def __init__(self, x):
  #         self.val = x
  #         self.next = None
  
  
  class Solution(object):
      def deleteDuplicates(self, head):
          """
          :type head: ListNode
          :rtype: ListNode
          """
          temp = head
          while temp is not None and temp.next is not None:
              if temp.val == temp.next.val:
                  temp.next = temp.next.next
              else:
                  temp = temp.next
          return head
  
subject: Remove Duplicates from Sorted List