#include <bits/stdc++.h>
using namespace std;
int main(){
  int N;
  cin >> N;
  vector<string> S(N);
  for (int i = 0; i < N; i++){
    cin >> S[i];
  }
  int ans = 0;
  for (int i = 0; i < N; i++){
    int cnt = 0;
    bool ok = true;
    for (int j = 0; j < N; j++){
      if (S[i][j] == 'A'){
        cnt++;
      }
      if (S[i][j] == 'B'){
        ok = false;
      }
    }
    if (cnt == N - 1 && ok){
      ans++;
    }
  }
  for (int i = 0; i < N; i++){
    int cnt = 0;
    bool ok = true;
    for (int j = 0; j < N; j++){
      if (S[j][i] == 'A'){
        cnt++;
      }
      if (S[j][i] == 'B'){
        ok = false;
      }
    }
    if (cnt == N - 1 && ok){
      ans++;
    }
  }
  int cnt1 = 0;
  bool ok1 = true;
  int cnt2 = 0;
  bool ok2 = true;
  for (int i = 0; i < N; i++){
    if (S[i][i] == 'A'){
      cnt1++;
    }
    if (S[i][i] == 'B'){
      ok1 = false;
    }
    if (S[i][N - 1 - i] == 'A'){
      cnt2++;
    }
    if (S[i][N - 1 - i] == 'B'){
      ok2 = false;
    }
  }
  if (cnt1 == N - 1 && ok1){
    ans++;
  }
  if (cnt2 == N - 1 && ok2){
    ans++;
  }
  cout << ans << endl;
}