#include <bits/stdc++.h>
using namespace std;
int main () {
	int N;
	cin >> N;
	char A[111][111];
	for (int i = 0; i < N; i ++) {
		for (int j = 0; j < N; j ++) {
			cin >> A[i][j];
		}
	}
	int ans = 0;
	for (int i = 0; i < N; i ++) {
		int a = 0, b = 0;
		for (int j = 0; j < N; j ++) {
			a += A[i][j] == 'A';
			b += A[i][j] == 'B';
		}
		ans += (a == N - 1) && (b == 0);
	}
	for (int j = 0; j < N; j ++) {
		int a = 0, b = 0;
		for (int i = 0; i < N; i ++) {
			a += A[i][j] == 'A';
			b += A[i][j] == 'B';
		}
		ans += (a == N - 1) && (b == 0);
	}
	for (int i = 0; i < 2; i ++) {
		int a = 0, b = 0;
		for (int j = 0; j < N; j ++) {
			int k = (i ? j : (N - j - 1));
			a += A[k][j] == 'A';
			b += A[k][j] == 'B';
		}
		ans += (a == N - 1) && (b == 0);
	}
	cout << ans << endl;
}