human
Give me a code to and the other steps required given the following:

Definition of ParentTreeNode:
class ParentTreeNode:
    def __init__(self, val):
        self.val = val
        self.parent, self.left, self.right = None, None, None
"""
class Solution:
    """
    @param root: The root of the tree
    @param A and B: Two node in the tree
    @return: The lowest common ancestor of A and B
    """ 
    def lowestCommonAncestorII(self, root, A, B):
        # Write your code here
        if not root:
            return root
        
        dic = {}
        while A:
            dic[A] = True
            A = A.parent
            
        while B:
            if B in dic:
                return B
            B = B.parent
        
Given the above code, generate some markdown instructions for it.
assistant
#Here is code to and the other steps required.

Lowest Common Ancestor II: with parent pointer

https://www.lintcode.com/en/problem/lowest-common-ancestor-ii/