def decode(ch):
   if ch == "A":
      return 1
   if ch == "B":
      return 2
   return 0


def transpose(A):
   H, W = len(A), len(A[0])
   return [[A[i][j] for i in range(H)] for j in range(W)]


DIR4 = [(1, 0), (0, 1), (-1, 0), (0, -1)]
DIR8 = DIR4 + [(1, 1), (1, -1), (-1, -1), (-1, 1)]

N = int(input())

S = [[decode(ch) for ch in input()] for i in range(N)]

from collections import Counter


def is_good(C):
   return C[1] == N-1 and C[2] == 0


def check_rows(A):
   H, W = len(A), len(A[0])
   res = 0
   for i in range(H):
      row = A[i]
      C = Counter(row)
      res += is_good(C)
   return res


a1 = check_rows(S)
a2 = check_rows(transpose(S))

ans = a1+a2

d1 = Counter([S[i][i] for i in range(N)])
d2 = Counter([S[i][N-1-i] for i in range(N)])

ans += is_good(d1) + is_good(d2)

print(ans)