Postorder Binary Tree

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Given a binary tree, print the postorder traversal of a given tree.

Post-order traversal is: LeftChild RightChild Root

Input format :
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 :
Post-order traversal, elements separated by space
Sample Input :
8 3 10 1 6 -1 14 -1 -1 4 7 13 -1 -1 -1 -1 -1 -1 -1
Sample Output :
1 4 7 6 3 13 14 10 8

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