题解 | #X形图案#

import sys

for line in sys.stdin:
    a = line.split()  # a 是个列表, 元素是字符串
    n = int(a[0])
    for i in range(1, n + 1):
        for j in range(1, n + 1):
            if j == i or j == n - i + 1:
                print('*', end='')
            else:
                print(' ', end='')
        print()