using System.Numerics;

public class Program
{
    public static void Main()
    {

        int num = int.Parse(Console.ReadLine() ?? string.Empty);
        //string[] str = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        //string str = Console.ReadLine() ?? string.Empty;

        string[] str = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');

        List<int> list = new List<int>();

        for(int i = 0; i < str.Length; i++)
        {
            if (str[i] != "0")
            {
                int a = int.Parse(str[i]);
                for(int j = 1;j <= a;j++ )
                {
                    list.Add(i+1);
                }
            }
        }
        list.Sort();
        for(int i = list.Count-1;i >= 0;i--)
        {
            Console.Write(list[i]);
        }
    }
}