N = int(input())
G = []
for i in range(N):
    S = list(input())
    tmp = []
    for i,v in enumerate(S):
        if v == "A":
            tmp.append(1)
        elif v == "B":
            tmp.append(10000)
        else:
            tmp.append(0)
    G.append(tmp)

cnt = 0

for i in G:
    if sum(i) == N-1:
        cnt += 1

G2 = list(map(list, map(reversed, zip(*G))))

for i in G2:
    if sum(i) == N-1:
        cnt += 1

a = 0
for i in range(N):
    a += G2[i][i]

if a == N-1:
    cnt += 1

b = 0
for i in range(N):
    b += G2[(i+1)*-1][i]

if b == N-1:
    cnt += 1

print(cnt)