N = int(input())
S = [input() for _ in range(N)]


ans = 0
for r in range(N):
    if S[r].count('A') == N-1:
        ans += 1

for c in range(N):
    cnt = 0
    for r in range(N):
        if S[r][c] == 'A':
            cnt += 1
    if cnt == N-1:
        ans += 1

cnt = 0
for d in range(N):
    if S[d][d] == 'A':
        cnt += 1
if cnt == N-1:
    ans += 1

cnt = 0
for d in range(N):
    if S[d][N-d-1] == 'A':
        cnt += 1
if cnt == N-1:
    ans += 1

print(ans)