const INF: usize = 1 << 50;

const B7: [[char; 7]; 7] = [
    ['a', 'b', 'a', '.', '.', '.', '.'],
    ['a', 'b', 'a', '.', '.', '.', '.'],
    ['b', 'a', 'c', 'c', '.', '.', '.'],
    ['b', 'a', '.', 'z', 'z', '.', '.'],
    ['a', '.', '.', '.', 'y', 'j', 'j'],
    ['a', '.', '.', '.', 'y', 'k', 'k'],
    ['.', 'a', 'a', 'x', 'x', 't', 't'],
];

const B6: [[char; 6]; 6] = [
    ['a', 'b', 'c', '.', '.', '.'],
    ['a', 'b', 'c', '.', '.', '.'],
    ['d', '.', 'f', 'f', 'g', 'g'],
    ['d', 'e', 'h', 'h', '.', '.'],
    ['.', 'e', '.', 'j', 'k', 'k'],
    ['i', 'i', '.', 'j', 'l', 'l'],
];

const B5: [[char; 5]; 5] = [
    ['a', 'b', 'c', '.', '.'],
    ['a', 'b', 'c', '.', '.'],
    ['d', 'e', 'e', 'f', 'f'],
    ['d', '.', 'i', 'g', 'g'],
    ['h', 'h', 'i', 'j', 'j'],
];

fn main() {
    let (r, w) = (std::io::stdin(), std::io::stdout());
    let mut sc = IO::new(r.lock(), w.lock());
    let n = sc.read();

    let b4: Vec<Vec<_>> = vec![
        "abcc", //
        "abdd", //
        "eefh", //
        "xxfh",
    ]
    .into_iter()
    .map(|s| s.chars().collect())
    .collect();

    if n <= 2 {
        println!("-1");
        return;
    }
    if n == 3 {
        println!("abb");
        println!("a.c");
        println!("bbc");
        return;
    }

    let k = n / 4 - 1;
    let r = n % 4 + 4;
    let mut ans = vec![vec!['.'; n]; n];
    for x in 0..k {
        for i in 0..4 {
            for j in 0..4 {
                ans[i + 4 * x][j + 4 * x] = b4[i][j];
            }
        }
    }
    for i in 0..r {
        for j in 0..r {
            ans[i + 4 * k][j + 4 * k] = match r {
                4 => b4[i][j],
                5 => B5[i][j],
                6 => B6[i][j],
                7 => B7[i][j],
                _ => unreachable!(),
            };
        }
    }

    for i in 0..n {
        for j in 0..n {
            sc.write(ans[i][j]);
        }
        sc.write("\n");
    }
}

fn brute_force(n: usize) {
    let mut board = vec![vec![INF; n]; n];
    let is_ok = rec(&mut board, 0, 3);
    if is_ok {
        println!("{:?}", board);
    }
}

fn rec(board: &mut Vec<Vec<usize>>, pos: usize, limit: u32) -> bool {
    let n = board.len();
    if pos == n * n {
        for i in 0..n {
            let mut set = 0;
            for j in 0..n {
                if board[i][j] == INF {
                    continue;
                }
                set |= 1 << board[i][j];
            }
            let count = (set as usize).count_ones();
            if count != limit {
                return false;
            }
        }
        for j in 0..n {
            let mut set = 0;
            for i in 0..n {
                if board[i][j] == INF {
                    continue;
                }
                set |= 1 << board[i][j];
            }
            let count = (set as usize).count_ones();
            if count != limit {
                return false;
            }
        }
        return true;
    }

    let (i, j) = (pos / n, pos % n);
    if j == n - 1 {
        let count = board[i]
            .iter()
            .filter(|&&j| j != INF)
            .fold(0, |sum, &j| sum | (1 << j));
        let count = (count as i32).count_ones();
        if count != limit {
            return false;
        }
    }
    if board[i][j] != INF {
        return rec(board, pos + 1, limit);
    }
    if i + 1 < n && board[i + 1][j] == INF {
        board[i][j] = pos;
        board[i + 1][j] = pos;
        if rec(board, pos + 1, limit) {
            return true;
        }
        board[i][j] = INF;
        board[i + 1][j] = INF;
    }
    if j + 1 < n && board[i][j + 1] == INF {
        board[i][j] = pos;
        board[i][j + 1] = pos;
        if rec(board, pos + 1, limit) {
            return true;
        }
        board[i][j] = INF;
        board[i][j + 1] = INF;
    }
    return rec(board, pos + 1, limit);
}

pub struct IO<R, W: std::io::Write>(R, std::io::BufWriter<W>);

impl<R: std::io::Read, W: std::io::Write> IO<R, W> {
    pub fn new(r: R, w: W) -> IO<R, W> {
        IO(r, std::io::BufWriter::new(w))
    }
    pub fn write<S: ToString>(&mut self, s: S) {
        use std::io::Write;
        self.1.write(s.to_string().as_bytes()).unwrap();
    }
    pub fn read<T: std::str::FromStr>(&mut self) -> T {
        use std::io::Read;
        let buf = self
            .0
            .by_ref()
            .bytes()
            .map(|b| b.unwrap())
            .skip_while(|&b| b == b' ' || b == b'\n' || b == b'\r' || b == b'\t')
            .take_while(|&b| b != b' ' && b != b'\n' && b != b'\r' && b != b'\t')
            .collect::<Vec<_>>();
        unsafe { std::str::from_utf8_unchecked(&buf) }
            .parse()
            .ok()
            .expect("Parse error.")
    }
    pub fn vec<T: std::str::FromStr>(&mut self, n: usize) -> Vec<T> {
        (0..n).map(|_| self.read()).collect()
    }
    pub fn chars(&mut self) -> Vec<char> {
        self.read::<String>().chars().collect()
    }
}


Measured memory_bytes: 9340