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

ans = 0
for i in range(n):
    a, b, d = 0, 0, 0
    for j in range(n):
        if S[i][j] == 'A':
            a += 1
        elif S[i][j] == 'B':
            b += 1
        else:
            d += 1
    if a == n - 1 and d == 1:
        ans += 1
    a, b, d = 0, 0, 0
    for j in range(n):
        if S[j][i] == 'A':
            a += 1
        elif S[j][i] == 'B':
            b += 1
        else:
            d += 1
    if a == n - 1 and d == 1:
        ans += 1
a, b, d = 0, 0, 0
for i in range(n):
    if S[i][i] == 'A':
        a += 1
    elif S[i][i] == 'B':
        b += 1
    else:
        d += 1
if a == n - 1 and d == 1:
    ans += 1
a, b, d = 0, 0, 0
for i in range(n):
    if S[i][~i] == 'A':
        a += 1
    elif S[i][~i] == 'B':
        b += 1
    else:
        d += 1
if a == n - 1 and d == 1:
    ans += 1
print(ans)