#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;
int n,a,b,c,ans=0;
char s[100];
int main(){
	scanf("%d",&n);
	for(register int i=1;i<=n;i++){
		scanf("%s",s);
		int len=strlen(s);
		for(register int j=1;j<len;j++){
			if(s[j]=='B'&&s[j-1]=='A')ans++;
		}
		if(s[0]=='B'&&s[len-1]=='A'){
			c++;
			continue;
		}
		if(s[0]=='B')b++;
		if(s[len-1]=='A')a++;
	}
	if(c){
		c--;
		if(a)c++,a--;
		if(b)c++,b--;
		printf("%d\n",ans+c+min(a,b));
	}
	else{
		printf("%d\n",ans+min(a,b));
	}
	
	return 0;
} 