N = int(input())
S = tuple(tuple(input()) for _ in range(N))

cnt = 0
for _ in range(2):
  cnt += sum(row.count('A') == N-1 for row in S)
  S = tuple(zip(*S))
cnt += sum(S[i][i] == 'A' for i in range(N)) == N-1
cnt += sum(S[i][~i] == 'A' for i in range(N)) == N-1

print(cnt)