N = int(input())
G = [list(input()) for _ in range(N)]
def check(S):
    a = b = c = 0
    for i in S:
        if i == 'A': a += 1
        if i == 'B': b += 1
        if i == '.': c += 1
    return a == N - 1 and c == 1
ans = sum(check(G[h]) for h in range(N))
ans += sum(check([G[h][w] for h in range(N)]) for w in range(N))
ans += check([G[i][i] for i in range(N)])
ans += check([G[i][N - i - 1] for i in range(N)])
print(ans)