using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
 
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
 
            string filename = "abcde fgh i klmno" ;
            Regex regex = new Regex("[o ,a ,i ,e ,y ,u ]");  
            filename = regex.Replace(filename, "enko ");    
 
            Console.WriteLine(filename);
 
        }
 
    }
}

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