638 B | 628 chars
"""
[13015: 별 찍기 - 23](https://www.acmicpc.net/problem/13015)
Tier: Silver 5
Category: 구현
"""
def solution():
n = int(input())
print("*" * n + " " * ((n - 2) * 2 + 1) + "*" * n)
for i in range(1, n - 1):
print(" " * i + "*" + " " * (n - 2) + "*" + " " * ((n - 2 - i) * 2 + 1) + "*" + " " * (n - 2) + "*")
print(" " * (n - 1) + "*" + " " * (n - 2) + "*" + " " * (n - 2) + "*")
for i in range(n - 2, 0, -1):
print(" " * i + "*" + " " * (n - 2) + "*" + " " * ((n - 2 - i) * 2 + 1) + "*" + " " * (n - 2) + "*")
print("*" * n + " " * ((n - 2) * 2 + 1) + "*" * n)
if __name__ == '__main__':
solution()