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Sum of Left Leaf Nodes (Function Problem)

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

```Input :
1
/  \
2    3
/  \     \
4    5     8
/  \        /  \
7    2      6    9
Output :
sum = 6 + 7 = 13```

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 left leaf nodes of the binary tree.

Constraints:
1<=T<=100
0<=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:
2
130

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.

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

Contributor: Harshit Sidhwa, Saksham Raj Seth

##### It is recommended to 'Compile & Test' your code before clicking 'Submit'!

Compilation/Execution Result: