PROBLEM STATEMENT
You are given 2 rectangular parallelepipeds (rectangular solids) in space, edges parallel to 
coordinate axes. Compute the volume of their union.

For example, consider the two following parallelepipeds (they are divided into unit cubes for 
clarity):
 and 
When combined in the following manner, their union is a figure of volume 12 (it consists of 12 
unit blocks: ten on the bottom level, and two on the top level):


You are given a String[] parallelepipeds containing exactly two elements. Each element represents 
a single parallelepiped, and is formatted as "x1 y1 z1 x2 y2 z2" (quotes for clarity only), where 
(x1, y1, z1) and (x2, y2, z2) are the coordinates of opposing corners of the parallelepiped.

DEFINITION
Class:ParallelepipedUnion
Method:getVolume
Parameters:vector <string>
Returns:int
Method signature:int getVolume(vector <string> parallelepipeds)


CONSTRAINTS
-parallelepipeds will contain exactly 2 elements.
-Each element of parallelepipeds will be formatted as "x1 y1 z1 x2 y2 z2" (quotes for clarity only).
-In each element of parallelepipeds, x1 < x2, y1 < y2, z1 < z2.
-All coordinates will be integers between 1 and 100, inclusive, without extra leading zeroes.


EXAMPLES

0)
{"1 1 1 4 4 2", "3 2 1 5 3 3"}

Returns: 12

The example from the problem statement.

1)
{"1 1 1 2 2 2", "3 3 3 4 4 4"}

Returns: 2

Two unit cubes that do not intersect.

2)
{"1 10 20 5 15 23", "2 12 22 3 14 23"}

Returns: 60

One parallelepiped inside another.

3)
{"28 31 21 67 60 81","60 1 21 67 50 81"}

Returns: 80460

4)
{"34 3 50 37 6 53","36 1 51 38 4 55"}

Returns: 49

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