Given a Binary Tree your task is to print the nodes which dont have a sibling node .You are required to complete the function **printSibling. **You should not read any input from stdin/console. There are multiple test cases. For each test case, this method will be called individually.

**Input:** The first line of input contains T, denoting the number of testcases. For each testcase there will be 2 lines. The first line contains the number of edges. The second line contains nodes(number of edges + 1) data. The task is to complete the function **printSibling **which takes 1 argument, root of the Tree. The struct node has a data part which stores the data, pointer to left child and pointer to right child. There are multiple test cases. For each test case, this method will be called individually.

**Output:**

The function should print all the nodes separated by space which don't have sibling in the tree in sorted order if every node has a tree than print -1.

**Note:** The **Input/Ouput** format and **Example** given are used for system's internal purpose, and should be used by a user for **Expected Output** only. As it is a function problem, hence a user should not read any input from stdin/console. The task is to complete the function specified, and not to write the full code.

**Constraints:**

1 <=T<= 30

1 <=Number of nodes<= 100

1 <=Data of a node<= 1000

**Example:**

**Input**

1

1

1 2 L

**Output **

2

**Explanation:**

**Testcase 1:** In above example there is one test case which represents a tree with 2 nodes and 1 edge where root is 1, left child of 1 is 2 .

Author: support3

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