N=int(input())
S=[input() for i in range(N)]
ans=0
for x in range(N):
  A=0
  B=0
  C=0
  for y in range(N):
    if S[x][y]=='A':
      A+=1
    elif S[x][y]=='B':
      B+=1
    else:
      C+=1
  if (A,C)==(N-1,1):
    ans+=1
    
for y in range(N):
  A=0
  B=0
  C=0
  for x in range(N):
    if S[x][y]=='A':
      A+=1
    elif S[x][y]=='B':
      B+=1
    else:
      C+=1
  if (A,C)==(N-1,1):
    ans+=1

A=0
B=0
C=0
for x in range(N):
  if S[x][x]=='A':
    A+=1
  elif S[x][x]=='B':
    B+=1
  else:
    C+=1
if (A,C)==(N-1,1):
  ans+=1

A=0
B=0
C=0
for x in range(N):
  if S[x][N-1-x]=='A':
    A+=1
  elif S[x][N-1-x]=='B':
    B+=1
  else:
    C+=1
if (A,C)==(N-1,1):
  ans+=1

print(ans)