Is node present?

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Given a binary tree and an integer x, check if node with data x is present in the input binary tree or not. Return true or false.

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)
Line 2 : Integer x
Output Format :
true or false
Sample Input :
8 3 10 1 6 -1 14 -1 -1 4 7 13 -1 -1 -1 -1 -1 -1 -1
7
Sample Output :
true

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