 Rectangle Area

Given eight integers A, B, C, D, E, F, G and H which represent two rectangles in a 2D plane.

For the first rectangle it’s bottom left corner is (A, B) and top right corner is (C, D) and
for the second rectangle it’s bottom left corner is (E, F) and top right corner is (G, H).

Find and return the overlapping area of the two rectangles.

Input Format

The eight arguments given are the integers A, B, C, D, E, F, G and H.

Output Format

Return the overlapping area of the two rectangles.

Constraints

-10000 <= A <= C <= 10000
-10000 <= B <= D <= 10000
-10000 <= E <= G <= 10000
-10000 <= F <= H <= 10000

For Example

Input 1:
A = 0   B = 0
C = 4   D = 4
E = 2   F = 2
G = 6   H = 6
Output 1:
4

Input 2:
A = 0   B = 0
C = 4   D = 4
E = 2   F = 2
G = 3   H = 3
Output 2:
1
NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a doubt? Checkout Sample Codes for more details. 