###### Description

The rectangle is a figure with four straight sides and four right angles. Given 3 points of a rectangle in a coordinate plane, figure out the last point to make a rectangle.

`v` is an array, containing 3 points of a rectangle. By using `v`, make a solution function that returns the last point.

##### Constraints
• `v` is an array, containing 3 points of a triangle.
• Each of `v`'s element has `x` and `y` coordinates, which represents a point of a rectangle.
• In `v`, two points can be connected either with a vertical or horizontal line.
• Each coordinate is a natural number, less than or equal to 1 billion.
• Return the last point, [coordiante x, coordinate y].
##### Examples
v result
[[1, 4], [3, 4], [3, 10]] [1, 10]
[[1, 1], [2, 2], [1, 2]] [2, 1]

Example #1
When there are 3 points: [1, 4], [3, 4], [3, 10]
[1,10] will make a rectangle.

Example #2
When there are 3 points: [[1, 1], [2, 2], [1, 2]]
[2,1] will make a rectangle.

Result
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