using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    struct element

    {

      public    string name;

      public string sex;

      public int numComp;

    } ;

    public static void Main()

    {

        string input = "Jervie, 12, M , Jaimy ,11, F, Tony , 23, M ,Janey , 11, F";

        var elements = input.Split(',').Where(x => !string.IsNullOrWhiteSpace(x))

                                        .Select(x => x.Trim()).Chunk(3)

                                        .Select(x =>

                                                {

                                                    var i = x.ToList();

                                                    return new element

                                                    {

                                                        name = i[0],

                                                        numComp = int.Parse( i[1]),

                                                        sex = i[2],

                                                    };

                                                });

        var sorted = elements.OrderBy(x => x.numComp).ToList();

        var temp = sorted.Select(x => x.name + ", " + x.numComp+", " + x.sex  );

        var output =  string.Join(", ",temp);

        Console.WriteLine(output);

    }

}

​

public static class LinqExtension

{

    public static IEnumerable<IEnumerable<T>> Chunk<T>(this IEnumerable<T> source, int chunksize)

{

    while (source.Any())

    {

        yield return source.Take(chunksize);

        source = source.Skip(chunksize);

    }

}

}