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

ans=0

for i in range(n):
  cnt=0
  for j in range(n):
    if s[i][j]=='A':
      cnt+=1
    if s[i][j]=='B':
      cnt-=1
  if cnt==n-1:
    ans+=1
    
for j in range(n):
  cnt=0
  for i in range(n):
    if s[i][j]=='A':
      cnt+=1
    if s[i][j]=='B':
      cnt-=1
  if cnt==n-1:
    ans+=1
    
cnt=0
    
for i in range(n):
  if s[i][i]=='A':
    cnt+=1
  elif s[i][i]=='B':
    cnt-=1
    
if cnt==n-1:
  ans+=1
  
cnt=0
    
for i in range(n):
  if s[-i-1][i]=='A':
    cnt+=1
  elif s[-i-1][i]=='B':
    cnt-=1
    
if cnt==n-1:
  ans+=1
  
print(ans)