N = gets.chomp.to_i
s = []
ab = 0
a = 0
b = 0
ba = 0

i = 0
while i < N
  s = gets.chomp
  if s[0] == "B"
    if s[s.size-1] == "A"
      ba += 1
    else
      b += 1
    end
  elsif s[s.size-1] == "A"
    a += 1
  end
  for x in 0...s.size-1
    if s[x] == "A"
      if s[x+1] == "B"
        ab += 1
      end
    end
  end
  i += 1
end

aorb = 0
if a < b
  aorb = a
else
  aorb = b
end
if a==0 && b==0 && ba>0
  ba -= 1
end

answer = ab + ba + aorb

puts answer