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

int N;
string S[110];
int main(void){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    cin >> N;
    for(int i = 0;i < N;i++)cin >> S[i];
    int ans = 0;
    for(int i = 0;i < N;i++){
        int cnta = 0, cntb = 0;
        for(int j = 0;j < N;j++){
            cnta += S[i][j] == 'A';
            cntb += S[i][j] == 'B';
        }
        ans += (cnta == N - 1 && cntb == 0);
    }
    for(int j = 0;j < N;j++){
        int cnta = 0, cntb = 0;
        for(int i = 0;i < N;i++){
            cnta += S[i][j] == 'A';
            cntb += S[i][j] == 'B';
        }
        ans += (cnta == N - 1 && cntb == 0);
    }
    {
        int cnta = 0, cntb = 0;
        for(int i = 0;i < N;i++){
            cnta += S[i][i] == 'A';
            cntb += S[i][i] == 'B';
        }
        ans += (cnta == N - 1 && cntb == 0);
    }
    {
        int cnta = 0, cntb = 0;
        for(int i = 0;i < N;i++){
            cnta += S[i][N - 1 - i] == 'A';
            cntb += S[i][N - 1 - i] == 'B';
        }
        ans += (cnta == N - 1 && cntb == 0);
    }
    cout << ans << endl;
    return 0;
}