using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

class Program
{
    static void Main(string[] args)
    {
        new Program().Solve();
    }

    void Solve()
    {
        Scanner cin = new Scanner();
        int n = cin.NextInt();
        string[] s = new string[n];
        for (int i = 0; i < n; i++)
        {
            s[i] = cin.Next();
        }

        int count = 0;

        List<int> a = new List<int>();
        List<int> b = new List<int>();
        List<int> c1 = new List<int>();

        for (int i = 0; i < n; i++)
        {
            bool flag = true;
            string thisS = s[i].Clone() as string;
            while (flag)
            {
                int index = thisS.IndexOf("AB");
                if (index < 0)
                {
                    flag = false;
                }
                if (index >= 0)
                {
                    int length = thisS.Length;
                    thisS = thisS.Substring(index + 2, length - index - 2).Clone() as string;
                    count++;
                }
            }
            int lastIndex = s[i].Length - 1;
            if (s[i][0] == 'B' && s[i][lastIndex] == 'A')
            {
                c1.Add(i);
                continue;
            }
            if (s[i][lastIndex] == 'A')
            {
                a.Add(i);
            }
            if (s[i][0] == 'B')
            {
                b.Add(i);
            }
        }

        int ans = count;
        if (c1.Count == 0)
        {
            ans += Math.Min(a.Count, b.Count);
        }
        else if(a.Count + b.Count > 0)
        {
            ans += c1.Count + Math.Min(a.Count, b.Count);
        }
        else
        {
            ans += c1.Count - 1;
        }
        Console.WriteLine(ans);
    }
}


class Scanner
{
    string[] s;
    int i;

    char[] cs = new char[] { ' ' };

    public Scanner()
    {
        s = new string[0];
        i = 0;
    }

    public string Next()
    {
        if (i < s.Length) return s[i++];
        string st = Console.ReadLine();
        while (st == "") st = Console.ReadLine();
        s = st.Split(cs, StringSplitOptions.RemoveEmptyEntries);
        if (s.Length == 0) return Next();
        i = 0;
        return s[i++];
    }

    public int NextInt()
    {
        return int.Parse(Next());
    }

    public char[] ArrayChar()
    {
        return Next().ToCharArray();
    }
    public int[] ArrayInt(int N, int add = 0)
    {
        int[] Array = new int[N];
        for (int i = 0; i < N; i++)
        {
            Array[i] = NextInt() + add;
        }
        return Array;
    }

    public long NextLong()
    {
        return long.Parse(Next());
    }

    public long[] ArrayLong(int N, long add = 0)
    {
        long[] Array = new long[N];
        for (int i = 0; i < N; i++)
        {
            Array[i] = NextLong() + add;
        }
        return Array;
    }

    public double NextDouble()
    {
        return double.Parse(Next());
    }


    public double[] ArrayDouble(int N, double add = 0)
    {
        double[] Array = new double[N];
        for (int i = 0; i < N; i++)
        {
            Array[i] = NextDouble() + add;
        }
        return Array;
    }
}

Measured memory_bytes: 13536