#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;

int N, ans;
char grid[110][110];

int main() {
  cin >> N;
  for (int i = 0; i < N; i++) {
    for (int j = 0; j < N; j++) cin >> grid[i][j];
  }
  for (int i = 0; i < N; i++) {
    int cntA = 0, cntB = 0;
    for (int j = 0; j < N; j++) {
      if (grid[i][j] == 'A') cntA++;
      if (grid[i][j] == 'B') cntB++;
    }
    if (cntA == N - 1 && cntB == 0) ans++;
  }
  for (int j = 0; j < N; j++) {
    int cntA = 0, cntB = 0;
    for (int i = 0; i < N; i++) {
      if (grid[i][j] == 'A') cntA++;
      if (grid[i][j] == 'B') cntB++;
    }
    if (cntA == N - 1 && cntB == 0) ans++;
  }
  int cntA = 0, cntB = 0;
  for (int i = 0; i < N; i++) {
    if (grid[i][i] == 'A') cntA++;
    if (grid[i][i] == 'B') cntB++; 
  }
  if (cntA == N - 1 && cntB == 0) ans++;
  cntA = 0, cntB = 0;
  for (int i = 0; i < N; i++) {
    if (grid[i][N - 1 - i] == 'A') cntA++;
    if (grid[i][N - 1 - i] == 'B') cntB++; 
  }
  if (cntA == N - 1 && cntB == 0) ans++;
  cout << ans << endl;
  return 0;
}