Determine the square of the distance between the closest two points in a set of points. For example, among the points (1,1), (5, 1), and (1,3), the closest distance between two points is 2, the distance between (1,1) and (1,3). So the correct output is 22 = 4.

Input:
The first line is the number of points
Each subsequent line is the X and Y coordinates (positive integers) of one point, separated by a space

Output:
The square of the minimum distance between two of the input points, as an integer.