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

int main() {
  int N, Ans = 0, AC = 0, BC = 0; cin >> N;
  vector<string> S(N); for (string &T : S) cin >> T;

  for (int i = 0; i < N; i++) {
    AC = 0, BC = 0;
    for (int j = 0; j < N; j++) {
      if (S.at(i).at(j) == 'A') AC++;
      if (S.at(i).at(j) == 'B') BC++;
    }
    if (AC == N - 1 && BC == 0) Ans++;
  }

  for (int i = 0; i < N; i++) {
    AC = 0, BC = 0;
    for (int j = 0; j < N; j++) {
      if (S.at(j).at(i) == 'A') AC++;
      if (S.at(i).at(j) == 'B') BC++;
    }
    if (AC == N - 1 && BC == 0) Ans++;
  }

  AC = 0, BC = 0;
  for (int i = 0; i < N; i++) {
    if (S.at(i).at(i) == 'A') AC++;
    if (S.at(i).at(i) == 'B') BC++;
  }
  if (AC == N - 1 && BC == 0) Ans++;

  AC = 0, BC = 0;
  for (int i = 0; i < N; i++) {
    if (S.at(N - i - 1).at(i) == 'A') AC++;
    if (S.at(N - i - 1).at(i) == 'B') BC++;
  }
  if (AC == N - 1 && BC == 0) Ans++;

  cout << Ans << endl;
}