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

using ll = long long;
#define rep(i, n) for(int i = 0; i < n; i++)

int main() {
	int N;
	cin >> N;
	vector<string> s(N);
	rep(i, N) cin >> s[i];
	int ans = 0;
	rep(i, N) {
		int c = 0;
		rep(j, N) if(s[i][j] == 'A') c++;
		if(c == N - 1) ans++;
	}
	rep(j, N) {
		int c = 0;
		rep(i, N) if(s[i][j] == 'A') c++;
		if(c == N - 1) ans++;
	}
	int c = 0;
	rep(i, N) if(s[i][i] == 'A') c++;
	if(c == N - 1) ans++;
	c = 0;
	rep(i, N) if(s[N - 1 - i][i] == 'A') c++;
	if(c == N - 1) ans++;
	cout << ans << endl;
}