r=int(input())
for i in range(0,r):
for j in range(0,r):
if(i==0 or i==r-1):
print("*", end=" ")
else:
if((j==0 and i>0) or (j==r-1 and i<r-1)):
print("*", end=" ")
else:
print(" ",end=" ")
print()
cj1pbnQoaW5wdXQoKSkKZm9yIGkgaW4gcmFuZ2UoMCxyKToKCWZvciBqIGluIHJhbmdlKDAscik6CgkJaWYoaT09MCBvciBpPT1yLTEpOgoJCQlwcmludCgiKiIsIGVuZD0iICIpCgkJZWxzZToKCQkJaWYoKGo9PTAgYW5kIGk+MCkgb3IgKGo9PXItMSBhbmQgaTxyLTEpKToKCQkJCXByaW50KCIqIiwgZW5kPSIgIikKCQkJZWxzZToKCQkJCXByaW50KCIgIixlbmQ9IiAiKQoJcHJpbnQoKQ==