n = int(input())
S = [input() for _ in range(n)]
ans = 0
for i in range(n):
    c = 0
    for j in range(n):
        if S[i][j] == "A":
            c += 1
        elif S[i][j] == "B":
            c -= 1
    if c == n - 1:
        ans += 1
for j in range(n):
    c = 0
    for i in range(n):
        if S[i][j] == "A":
            c += 1
        elif S[i][j] == "B":
            c -= 1
    if c == n - 1:
        ans += 1

c = 0
for i in range(n):
    if S[i][i] == "A":
        c += 1
    elif S[i][i] == "B":
        c -= 1
if c == n - 1:
    ans += 1

c = 0
for i in range(n):
    if S[i][n - i - 1] == "A":
        c += 1
    elif S[i][n - i - 1] == "B":
        c -= 1
if c == n - 1:
    ans += 1

print(ans)