#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n;
	cin >> n;
	vector<string> A(n);
	int ans = 0;
	for(int y = 0; y < n; y++){
		cin >> A[y];
		int a = 0, b = 0;
		for(int x = 0; x < n; x++){
			a += A[y][x] == 'A';
			b += A[y][x] == 'B';
		}
		ans += (a == n - 1 && b == 0);
	}
	for(int x = 0; x < n; x++){
		int a = 0, b = 0;
		for(int y = 0; y < n; y++){
			a += A[y][x] == 'A';
			b += A[y][x] == 'B';
		}
		ans += (a == n - 1 && b == 0);
	}
	int a = 0, b = 0;
	for(int y = 0; y < n; y++){
		a += A[y][y] == 'A';
		b += A[y][y] == 'B';
	}
	ans += (a == n - 1 && b == 0);
	a = 0, b = 0;
	for(int y = 0; y < n; y++){
		a += A[y][n - 1 - y] == 'A';
		b += A[y][n - 1 - y] == 'B';
	}
	ans += (a == n - 1 && b == 0);
	cout << ans << '\n';
}