using System;

using System.Text.RegularExpressions;

​

public class Program

{

    public static void Main()

    {

        String compressedString=null;

        MatchCollection mc = Regex.Matches("B Cep%l %", @"\b^");

        foreach (Match m in mc)

            {

                    compressedString += m;

            }

        Console.WriteLine(compressedString);

    }

}