# 行ごと、列ごとにA数、B数を数えておき、あとは全マス全探索するか

N = int(input())
S = []
for i in range(N):
    S.append(input())
    
A_row = [0]*N
A_col = [0]*N
#B_row = [0]*N
#B_col = [0]*N

for i in range(N):
    for j in range(N):
        if S[i][j] == 'A':
            A_row[i] += 1
            A_col[j] += 1
        #elif S[i][j] == 'B':
        #    B_row[i] += 1
        #    B_col[j] += 1            
        

ans = 0
for i in range(N):
    for j in range(N):
        if S[i][j] == '.':
            if A_row[i]==N-1:
                ans += 1
            if A_col[j]==N-1:
                ans += 1

# ど真ん中チェック
if N%2 == 1:
    # \方向
    count_A = 0
    dot_count = 0
    for i in range(N):
        if S[i][i] == 'A':
            count_A += 1
        elif S[i][i] == '.':
            dot_count += 1
    if count_A == N-1 and dot_count == 1:
        ans += 1
    
    # /方向
    count_A = 0
    dot_count = 0
    for i in range(N):
        if S[i][N-1-i] == 'A':
            count_A += 1
        elif S[i][i] == '.':
            dot_count += 1
    if count_A == N-1 and dot_count == 1:
        ans += 1           
                
print(ans)