{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE BinaryLiterals #-}
{-# LANGUAGE MultiWayIf #-}
{-# LANGUAGE NumDecimals #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TupleSections #-}

import Control.Applicative
import Control.Arrow
import Control.Monad
import Control.Monad.ST

import Data.Char
import Data.List
import Data.Maybe

import qualified Data.ByteString.Char8 as B

import Data.Array.ST.Safe
import Data.STRef

import Debug.Trace
import Text.Printf

readInt = readLn :: IO Int
readInts = map ( fst . fromJust . B.readInt ) . B.words <$> B.getLine
readNInts = readInt >>= flip replicateM readInt

which a b f = if f then a else b
mp [ a, b ] = ( a, b )

main = do
	n <- readInt
	ss <- replicateM n getLine
	let
		inner = sum $ map countInner ss
		a = length $ filter ( uncurry (&&) . ( not . checkHead &&& checkLast ) ) ss
		b = length $ filter ( uncurry (&&) . ( checkHead &&& not . checkLast ) ) ss
		ba = length $ filter ( uncurry (&&) . ( checkHead &&& checkLast ) ) ss
	print $ inner + if 0 < a && 0 < b
		then 1 + ba + min a b - 1
		else ba

countInner [_] = 0
countInner (a:b:s)
	| a == 'A' && b == 'B' = 1 + countInner (b:s)
	| otherwise = countInner (b:s)

checkHead = ( == 'B' ) . head
checkLast = ( == 'A' ) . last