#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,ans=0,a=0,b=0,ba=0;
	string s;
	cin>>n;
	while(cin>>s){
		for(int i=0;i+1<s.size();i++)
			if(s[i]=='A'&&s[i+1]=='B')
				ans++;
		if(s[0]=='B'&&s.back()=='A')
			ba++;
		else if(s[0]=='B')
			b++;
		else if(s.back()=='A')
			a++;
	}
	if(ba==0)
		cout<<ans+min(a,b)<<endl;
	else if(a==0&&b==0)
		cout<<ans+ba-1<<endl;
	else if(a==0)
		cout<<ans+ba<<endl;
	else if(b==0)
		cout<<ans+ba<<endl;
	else
		cout<<ans+min(a,b)+ba<<endl;
}
