n=int(input())
a=[input() for _ in range(n)]
c=0
for i in range(n):
  A=0;B=0
  for j in range(n):
    if a[i][j]=='A':
      A+=1 
    elif a[i][j]=='B':
      B+=1 
  if A==n-1 and B==0:
    c+=1 
for i in range(n):
  A=0;B=0
  for j in range(n):
    if a[j][i]=='A':
      A+=1 
    elif a[j][i]=='B':
      B+=1 
  if A==n-1 and B==0:
    c+=1
A=0;B=0
for i in range(n):
  if a[i][i]=='A':
    A+=1 
  elif a[i][i]=='B':
    B+=1 
if A==n-1 and B==0:
  c+=1 
A=0;B=0
for i in range(n):
  if a[i][n-1-i]=='A':
    A+=1 
  elif a[i][n-1-i]=='B':
    B+=1 
if A==n-1 and B==0:
  c+=1 
print(c)