n = int(input())
a = [list(input()) for i in range(n)]
ans = 0
for i in range(n):
	cnt = 0
	for j in range(n):
		if a[i][j] == "B":
			break
		cnt += a[i][j] == "A"
	else:
		if cnt == n - 1:
			ans += 1
for i in range(n):
	cnt = 0
	for j in range(n):
		if a[j][i] == "B":
			break
		cnt += a[j][i] == "A"
	else:
		if cnt == n - 1:
			ans += 1
cnt = 0
for i in range(n):
	if a[i][i] == "B":
		break
	cnt += a[i][i] == "A"
else:
	if cnt == n - 1:
		ans += 1
cnt = 0
for i in range(n):
	if a[i][n - i - 1] == "B":
		break
	cnt += a[i][n - i - 1] == "A"
else:
	if cnt == n - 1:
		ans += 1
print(ans)