Reverse Level Order Traversal

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Level MEDIUM

Given a binary tree.Traverse the tree in the manner of reverse level order

Example:

                       5
                      / \  
                     6   2  
                        / \
                       2   3
                      / \
                     9   7

    Reverse level order traversal for this tree is:
    7 9 3 2 2 6 5
Input format :
Line 1 :  Elements in level order form (separated by space)
(If any node does not have left or right child, take -1 in its place)
Output Format :
Print Reverse level order traversal
Constraints :

1 <= N <= 10^5

Input:
5 6 2 2 3 -1 -1 9 7 -1 -1 -1 -1
Output :
7 9 3 2 2 6 5

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