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 List<string>() { 
                "RS01","RS05A","RS10","RS102","RS105A","RS105B","RS32A","RS80"
            };
            var sorted = strings.Select(str => new
            {
                str,
                num = int.Parse(new string(str.Skip(2).TakeWhile(Char.IsDigit).ToArray())),
                containsVersion = str.Skip(2).SkipWhile(Char.IsDigit).Any()
            }).Select(x => new{x.str, x.num, x.containsVersion, 
                version = !x.containsVersion ? "" : new string(x.str.Skip(2).SkipWhile(Char.IsDigit).ToArray())
            })
            .OrderBy(x => x.num).ThenBy(x => x.version);
            
            foreach(var x  in sorted)
                Console.WriteLine(x.str);
	}   
}