using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Globalization;
using System.Text.RegularExpressions;
using System.IO;
using System.Diagnostics;
using System.Net.Mail;
using System.Web;
 
namespace Enum
{
    class Program
    {
        static void Main(string[] args)
        {
            string s = "aa bb cc dd ee ff gg hh ii kk";
            var array = s.Split( new string[] {" "}, StringSplitOptions.RemoveEmptyEntries);
            string newstring = "";
            for (int i = 0; i < 5; i++)
                newstring += array[i] + " ";
            Console.WriteLine(newstring.Trim());
 
        }
    }
}
 

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