#include <bits/stdc++.h>
using namespace std;
#define Rep(i, n) for(int i = 0; i < (int)(n); i++)

int main() {
int x,y,z,n,p,ans;
x = y = z = p =  0;
cin >> n;
string s;
  Rep(i,n){
    cin >> s;
    Rep(j,s.length()-1)
    {
      if(s.at(j)=='A' && s.at(j+1)=='B')
      {
        p++;
      }
    }


    if(s.at(0)=='B')
    {
      if(s.at(s.length()-1) == 'A')
      z++;
      else
      x++;
    }
    else if(s.at(s.length()-1) == 'A')
    y++;

  }
if( x== 0 && y== 0 && z > 0)
ans = z-1+p;
else
ans = p + z + min(x,y);
  cout << ans << endl;
}