import sys
input = sys.stdin.readline
N = int(input())
S = [input().strip() for _ in range(N)]
h = [0 for _ in range(N)]
w = [0 for _ in range(N)]
for i in range(N):
    for j in range(N):
        if S[i][j]=="A":
            h[j] += 1
            w[i] += 1
        elif S[i][j]=="B":
            h[j] -= 1
            w[i] -= 1
ans = 0
for i in range(N):
    if h[i]==N-1:
        ans+=1
    if w[i]==N-1:
        ans+=1
tmp = 0
tmp2 = 0
for i in range(N):
    if S[i][i]=="A":
        tmp+=1
    elif S[i][i]=="B":
        tmp-=1
    if S[i][N-1-i]=="A":
        tmp2+=1
    elif S[i][N-1-i]=="B":
        tmp2-=1
if tmp==N-1:
    ans += 1
if tmp2==N-1:
    ans += 1
print(ans)