import java.util.Scanner

import scala.annotation.tailrec
import scala.collection.mutable.ArrayBuffer


object Main {
  def read() = {
    val sc = new Scanner(System.in)
    val n = sc.nextInt()
    val strs = for (_ <- 0 until n) yield sc.next()
    (n, strs)
  }

  def solve(n:Int, strs: IndexedSeq[String]): Int={
    // AB含み
    // A終わり
    // B始まり
    // A終わりB始まり

    val nContainsAB = strs.count(str => str.contains("AB"))
    val nAEnd = strs.count(str => str.last == 'A')
    val nBBegin = strs.count(str => str.head == 'B')
    val nAEndBBEgin = strs.count(str => str.last == 'A' && str.head=='B')

    if(nAEndBBEgin == nAEnd && nAEndBBEgin == nBBegin){
      nContainsAB + nAEndBBEgin - 1
    }else{
      nContainsAB + Math.min(nAEnd, nBBegin)
    }
  }

  def main(args: Array[String]): Unit = {
    val (n, strs) = read()
    println(solve(n,strs))
  }
}