using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(FormatTitle("abc,   def,efd,dfd, sdfs"));

    }

    private static string FormatTitle(string title)

        {

            string[] titleList = Array.ConvertAll(title.Split(','), p => p.Trim());

​

            return String.Join(", ", titleList.ToArray(), 0, titleList.Length - 1) + (titleList.LastOrDefault().Trim()!=""? " and " + titleList.LastOrDefault():"");

        }

}