Nodes without sibling

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Given a binary tree, print all nodes that don’t have a sibling.

Edit : Print the elements in different lines. And order of elements doesn't matter.
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 :
Print nodes separated by new line.
Sample Input :
5 6 10 2 3 -1 -1 -1 -1 -1 9 -1 -1
Sample Output :
9

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