mod io {
    #[macro_export]
    macro_rules! scan {
        ($r:expr, [$t:tt; $n:expr]) => ((0..$n).map(|_| scan!($r, $t)).collect::<Vec<_>>());
        ($r:expr, ($($t:tt),*)) => (($(scan!($r, $t)),*));
        ($r:expr, [u8]) => (io::scan($r));
        ($r:expr, String) => (io::scan($r).into_iter().map(char::from).collect::<String>());
        ($r:expr, $t:ty) => (scan!($r, String).parse::<$t>().unwrap());
    }

    pub fn scan<R: std::io::BufRead>(r: &mut R) -> Vec<u8> {
        let mut res = Vec::new();
        loop {
            let buf = match r.fill_buf() {
                Ok(buf) => buf,
                Err(e) if e.kind() == std::io::ErrorKind::Interrupted => continue,
                Err(e) => panic!(e), 
            };
            let (done, used) = match buf.iter().position(u8::is_ascii_whitespace) {
                Some(i) => {
                    res.extend_from_slice(&buf[..i]);
                    (res.len() > 0, i + 1)
                }
                None => {
                    res.extend_from_slice(buf);
                    (buf.is_empty(), buf.len())
                }
            };
            r.consume(used);
            if done { return res; }
        }
    }
}

fn run<R: std::io::BufRead, W: std::io::Write>(reader: &mut R, writer: &mut W) {
    let (w, h, x) = scan!(reader, (usize, usize, usize));

    if h == 1 && w == 1 && x > 9 || (h == 1 || w == 1) && x > 18 || x > 36 {
        writer.write_all(b"-1\n").ok();
        return;
    };
    if x > 9 && (w % 3 != 2 && h % 3 != 2) {
        writer.write_all(b"-1\n").ok();
        return;
    }
    if x > 18 && (w % 3 != 2 || h % 3 != 2) {
        writer.write_all(b"-1\n").ok();
        return;
    }

    let mut ans = vec![vec![b'0'; w]; h];
    let si = if h % 3 == 0 { 1 } else { 0 };
    let sj = if w % 3 == 0 { 1 } else { 0 };
    for i in (si..h).step_by(3) {
        for j in (sj..w).step_by(3) {
            let mut x = x;
            for p in i..(h.min(i + if h % 3 == 2 { 2 } else { 1 })) {
                for q in j..(w.min(j + if w % 3 == 2 { 2 } else { 1 })) {
                    let v = x.min(9);
                    x -= v;
                    ans[p][q] = b'0' + v as u8;
                }
            }
        }
    }

    for ans in ans {
        writer.write_all(&ans).ok();
        writer.write_all(b"\n").ok();
    }
}

fn main() {
    let (stdin, stdout) = (std::io::stdin(), std::io::stdout());
    let mut reader = std::io::BufReader::new(stdin.lock());
    let mut writer = std::io::BufWriter::new(stdout.lock());
    run(&mut reader, &mut writer);
}