n=int(input())
s=[input() for i in range(n)]
g=0
for i in range(n):
	a=0
	b=0
	for j in range(n):
		a+=s[i][j]=="A"
		b+=s[i][j]=="B"
	g+=a==n-1 and b==0
for i in range(n):
	a=0
	b=0
	for j in range(n):
		a+=s[j][i]=="A"
		b+=s[j][i]=="B"
	g+=a==n-1 and b==0
a=0
b=0
for i in range(n):
	a+=s[i][i]=="A"
	b+=s[i][i]=="B"
g+=a==n-1 and b==0
a=0
b=0
for i in range(n):
	a+=s[i][~i]=="A"
	b+=s[i][~i]=="B"
g+=a==n-1 and b==0
print(g)