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Sum of Right Leaf Nodes
Easy Accuracy: 50.16% Submissions: 11236 Points: 2

Given a Binary Tree of size N, your task is to complete the function rightLeafSum(), that should return the sum of all the leaf nodes that are right child of their parent of the given binary tree.
Example:

Input :
1
/  \
2    3
/  \     \
4    5     8
\        /  \
2       6   7
Output :
sum = 2 + 5 + 7 = 14

Input:
The function takes a single arguments as input, the reference pointer to the root of the binary tree.
There are T test cases and for each test case the function will be called separately.

Output:
The function should return the sum of all the right leaf nodes of the binary tree.

Constraints:
1<=T<=100
1<=N<=100

Example:
Input:

2
2
1 2 L 1 3 R
5
10 20 L 10 30 R 20 40 L 20 60 R 30 90 L
Output:
3
60

Explanation:
Test Case 1:

Tree formed is as follows:
1
/    \
2      3

Here, there are 2 leaf nodes (2 and 3). Out of these, only 3 is a right child of its parent. Hence, the answer is 3.

Test Case 2:
The tree formed is as follows:
10
/       \
20        30
/     \      /
40   60  90

Here, there are 3 leaf nodes (40, 60 and 90). Out of these, only 60 is a right child of its parent. Hence, the answer is 60.

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 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.