N=int(input())
S=[input() for i in range(N)]
result=0
for i in range(N):
  count=0
  for j in range(N):
    if S[i][j]!='A':
      if S[i][j]=='B':
        count+=10
      count+=1
  if count==1:
    result+=1
for j in range(N):
  count=0
  for i in range(N):
    if S[i][j]!='A':
      count+=1
    if S[i][j]=='B':
        count+=10
  if count==1:
    result+=1
count=0
for i in range(N):
  if S[i][i]!='A':
    count+=1
  if S[i][i]=='B':
        count+=10
if count==1:
  result+=1
count=0
for i in range(N):
  if S[N-1-i][i]!='A':
    count+=1
  if S[N-1-i][i]=='B':
        count+=10
if count==1:
  result+=1
print(result)