Preorder Binary Tree

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

Pre-order traversal is: Root LeftChild RightChild

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 :
Pre-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 :
8 3 1 6 4 7 10 14 13

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