N=int(input())
S=[]
for _ in range(N):
    S.append(input())
ans=0
for i in range(N):
    d=0
    for j in range(N):
        if S[i][j]=='A':
            d+=1
        elif S[i][j]=='B':
            d+=1000
    if d==N-1:
        ans+=1
for j in range(N):
    d=0
    for i in range(N):
        if S[i][j]=='A':
            d+=1
        elif S[i][j]=='B':
            d+=1000
    if d==N-1:
        ans+=1
d=0
for i in range(N):
    if S[i][i]=='A':
        d+=1
    elif S[i][i]=='B':
        d+=1000
if d==N-1:
     ans+=1
d=0
for i in range(N):
    if S[i][N-1-i]=='A':
        d+=1
    elif S[i][N-1-i]=='B':
        d+=1000
if d==N-1:
     ans+=1
print(ans)