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Difficulty Level:

Medium

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Inorder Successor in BST (Function Problem)
     

Given a BST,  and a reference to a Node x the task is to find the Inorder Successor of the node . 

Input:
The first line of input contains an integer T denoting the no of test cases. Then T test cases follow.  The second line consist of an integer N. Then in the next line are N space separated values of the BST nodes. In the next line is an integer x representing the value of the node in the BST.

Output:
For each test case output will be the Inorder successor of the given node. If no such successor is present output will be -1.

Constraints:
1<=T<=100
1<=N<1100
1<=A[]<=1000

Example:
Input:

2
7
20 8 22 4 12 10 14
8
7
20 8 22 4 12 10 14
10
Output:
10
12

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** For More Input/Output Examples Use 'Expected Output' option **

Contributor: Harshit Sidhwa,Saksham Raj Seth


					   
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