using System;

using System.Collections.Generic;

using System.Linq;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

        Regex r = new Regex(@"Select TOP (?<t>\d+)(?<q>.*?order by[ a-z]+)");

        string input = "Select TOP 2 * from customer order by id desc";

        string output = r.Replace(input, "Select ${q} LIMIT ${t}");

        Console.Write(output);

    }

}