中文说明：第一步：首先对数字进行排序
English Description：
Step I: First the numbers are sorted vertically i.e. sort elements of each column in the ascending order. Step II: Numbers are sorted horizontally i.e. sort elements of each row in the ascending order. Step III: Sort the cross diagonal elements and pick up the middle element as the median element of the window. Minimum is the first and maximum is the last element in the window of the nine elements