human
Solve the following python programming problem given the following code:
# Definition for a multi tree node.
# class MultiTreeNode(object):
#     def __init__(self, x):
#         self.val = x
#         children = [] # children is a list of MultiTreeNode

class Solution:
    # @param {MultiTreeNode} root the root of k-ary tree
    # @return {int} the length of the longest consecutive sequence path
    def longestConsecutive3(self, root):
        # Write your code here
        longest, _, _ = self.helper(root)
        return longest
        
        
        
    def helper(self, root):
        if root is None:
            return 0, 0, 0
        
        len, down, up = 0, 0, 0 
        for child in root.children:
            clen, cdown, cup = self.helper(child)
            if child.val + 1 == root.val:
                down = max(down, cdown + 1)
            if child.val - 1 == root.val:
                up = max(up, cup + 1)
            len = max(len, clen)
        
        len = max(len, down + up + 1)
        
        return len, down, up
Given the above code, generate some markdown instructions for it.
assistant
#Here is the Python code you requested.

Binary Tree Longest Consecutive Sequence III

It's follow up problem for Binary Tree Longest Consecutive Sequence II
Given a k-ary tree, find the length of the longest consecutive sequence path.
The path could be start and end at any node in the tree