import sys
input = sys.stdin.readline

N=int(input())
MAP=[input().strip() for i in range(N)]

ANS=0

for i in range(N):
    A=0
    B=0
    dot=0

    for j in range(N):
        if MAP[i][j]=="A":
            A+=1
        elif MAP[i][j]=="B":
            B+=1
        else:
            dot+=1

    if A==N-1 and dot==1:
        ANS+=1

for j in range(N):
    A=0
    B=0
    dot=0

    for i in range(N):
        if MAP[i][j]=="A":
            A+=1
        elif MAP[i][j]=="B":
            B+=1
        else:
            dot+=1

    if A==N-1 and dot==1:
        ANS+=1

A=0
B=0
dot=0
for i in range(N):
    if MAP[i][i]=="A":
        A+=1
    elif MAP[i][i]=="B":
        B+=1
    else:
        dot+=1

if A==N-1 and dot==1:
    ANS+=1

A=0
B=0
dot=0
for i in range(N):
    if MAP[i][N-1-i]=="A":
        A+=1
    elif MAP[i][N-1-i]=="B":
        B+=1
    else:
        dot+=1

if A==N-1 and dot==1:
    ANS+=1


print(ANS)