#ifdef NACHIA
#define _GLIBCXX_DEBUG
#else
#define NDEBUG
#endif
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <queue>
#include <array>
#include <cmath>
#include <atcoder/modint>
using i64 = long long;
using u64 = unsigned long long;
#define rep(i,n) for(i64 i=0; i<(i64)(n); i++)
#define repr(i,n) for(i64 i=(i64)(n)-1; i>=0; i--)
const i64 INF = 1001001001001001001;
const char* yn(bool x){ return x ? "Yes" : "No"; }
template<typename A> void chmin(A& l, const A& r){ if(r < l) l = r; }
template<typename A> void chmax(A& l, const A& r){ if(l < r) l = r; }
template<typename A> using nega_queue = std::priority_queue<A,std::vector<A>,std::greater<A>>;
using Modint = atcoder::static_modint<998244353>;
//#include "nachia/vec.hpp"
using namespace std;

void testcase(){
    int N; cin >> N;
    vector<string> A(N); rep(i,N) cin >> A[i];
    int ans = 0;
    auto isreach = [&](string s) -> bool {
        int ca = 0, cb = 0;
        rep(i,N) if(s[i] == 'A') ca++;
        rep(i,N) if(s[i] == 'B') cb++;
        if(ca == N-1 && cb == 0) return true;
        return false;
    };
    rep(i,N) if(isreach(A[i])) ans++;
    rep(i,N){
        string s; rep(j,N) s.push_back(A[j][i]);
        if(isreach(s)) ans++;
    }
    rep(t,2){
        string s; rep(j,N) s.push_back(A[j][j]);
        if(isreach(s)) ans++;
        reverse(A.begin(), A.end());
    }
    cout << ans << endl;
}

int main(){
    ios::sync_with_stdio(false); cin.tie(nullptr);
    #ifdef NACHIA
    int T; cin >> T; for(int t=0; t<T; T!=++t?(cout<<'\n'),0:0)
    #endif
    testcase();
    return 0;
}