n=int(input())
s=[]
m=n
while m>0:
    s.append(input())
    m-=1
cntx=0
cnty=0

reaches=0
for i in range(n):
    for j in range(n):
        if s[i][j]=="A":
            cntx+=1
        elif s[i][j]=="B":
            cntx=-1000
        if s[j][i]=="A":
            cnty+=1
        elif s[j][i]=="B":
            cnty=-1000
    if cntx==n-1:
        reaches+=1
    if cnty==n-1:
        reaches+=1
    cntx=0
    cnty=0

cntx=0
cnty=0
for i in range(n):
    if s[i][i]=="A":
        cntx+=1
    elif s[i][i]=="B":
        cntx=-1000
    if s[i][n-1-i]=="A":
        cnty+=1
    elif s[i][n-1-i]=="B":
        cnty=-1000
if cntx==n-1:
    reaches+=1
if cnty==n-1:
    reaches+=1
print(reaches)