n=int(input())
s=[input()for i in range(n)]
C="."+"A"*(n-1)
r=sum(C=="".join(sorted(i))for i in s)+sum(C=="".join(sorted(i))for i in zip(*s))
c=d=""
for i in range(n):c+=s[i][i];d+=s[i][~i]
print(r+(C=="".join(sorted(c)))+(C=="".join(sorted(d))))