# Definition for a binary tree node.
class TreeNode:
    def __init__(self, x):
        self.val = x
        self.left = None
        self.right = None

class Solution:
    def sumEvenGrandparent(self, root):
        if root is None:
            return 0
        return self.sumEG(root, False, False)
        
    def sumEG(self, tree, grandParentEven, parentEven):
          
        sum = 0 
        if tree is None:
            return sum
        
        if grandParentEven:
            sum += tree.val
        
        sum += self.sumEG(tree.left, parentEven, tree.val % 2 == 0)
        sum += self.sumEG(tree.right, parentEven, tree.val % 2 == 0)
        
        return sum
    
s = Solution()
print("Expected: 18")
tree = TreeNode(6)
a = TreeNode(7)
b = TreeNode(2)
c = TreeNode(7)
d = TreeNode(8)
e = TreeNode(9)
f = TreeNode(1)
g = TreeNode(4)
h = TreeNode(1)
i = TreeNode(3)
j = TreeNode(5)

i.right = j
d.right = i
d.left = h
tree.right = d

c.right = g
c.left = f
a.right = c
b.left = e
a.left = b
tree.left = a

print("Got:", s.sumEvenGrandparent(tree))