use proconio::{fastout, input};

#[fastout]
fn main() {
    input! {
        n: u8,
        c: [u8; 9],
    }

    println!("{}", output(solve(n, c)))
}

fn solve(_n: u8, c: Vec<u8>) -> Vec<u8> {
    c.into_iter()
        .enumerate()
        .rev()
        .map(|(i, c)| [b'0' + (i + 1) as u8].repeat(c as usize))
        .flatten()
        .collect()
}

fn output(ans: Vec<u8>) -> String {
    String::from_utf8(ans).unwrap()
}