use proconio::input;
use proconio::marker::Chars;

fn main () {
    input! {
        n: usize,
        b: [Chars;n],
    }
    //println!("{:?}",b);
    let mut ans = 0;
    ans += b.iter()
        .filter(|row| {
            row.iter()
                .filter(|&&c| c == 'A')
                .count() == n-1
        })
        .count();


    ans += (0..b[0].len())
        .filter(|&col| {
            b.iter()
                .filter(|row| row[col] == 'A')
                .count() == n-1
        })
        .count();
    println!("{}", ans);
        
}