using System;
using System.Linq;
using System.Collections.Generic;
using System.Globalization;
using System.Net;
 
 
public class Test
{
	public static void Main()
	{
            var strings = new[] { 
"FD1","FD5","FD10","FD102","FD105","FD10","FD32","FD80", "FD31", "FD21", "FDnon"
};
            strings = strings.Select(str => new
            {
                str,
                num = str.Substring(2).All(Char.IsDigit) ? int.Parse(str.Substring(2)) : 0
            })
            .OrderBy(x => x.num)
            .Select(x => x.str)
            .ToArray();
 
            foreach(var s in strings)
            Console.WriteLine(s);
	}   
}
 
 
 

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