using System;

using System.Collections.Generic;

using System.Text.RegularExpressions;

using System.Linq;

​

public class Program

{   

    public static void Main()

    {

        List<string> leaderboardList = new List<string>();

        leaderboardList.Add("ORAN Arsenal Hard 3");

        leaderboardList.Add("ORAN_A Arsenal Hard 5");

        leaderboardList.Add("ORAN_B Arsenal Hard 1");

        leaderboardList.Add("ORAN_C Arsenal Hard 15");

        leaderboardList.Add("ORAN_C Arsenal Hard ");

        leaderboardList = leaderboardList.OrderByDescending(x =>Convert.ToInt32((string.IsNullOrEmpty(Regex.Match(x, @"\d+").Value)?"0":Regex.Match(x, @"\d+").Value))).ToList();

        foreach (var item in leaderboardList)

        {

            Console.WriteLine(item);

        }

    }

}