use proconio::input;

fn main() {
    input! {
        n: usize,
    }
    let mut ans = vec![vec!['.'; n]; n];
    for i in 0..n {
        ans[i][n - 1 - i] = '#';
        if i < n - 1 {
            ans[i + 1][n - 1 - i] = '#';
        }
    }
    for row in ans {
        println!("{}", row.iter().collect::<String>());
    }
}