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

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

int main() {
  int N;
  cin >> N;
  vector<string> S(N);
  rep(i, N) cin >> S[i];
  int reach = 0;
  rep(i, N) {
    int n = 0, m = 0;
    rep(j, N) {
      if (S[i][j] == 'A')
	n++;
      if (S[j][i] == 'A')
        m++;
    }
    if (n == N-1)
      reach++;
    if (m == N-1)
      reach++;
  }
  int p = 0, q = 0;
  rep(i, N) {
    if (S[i][i] == 'A')
      p++;
    if (S[i][(N-1)-i] == 'A')
      q++;
  }
  if (p == N-1)
    reach++;
  if (q == N-1)
    reach++;
  cout << reach << endl;
  return 0;
}