using System;
using System.Globalization;
using System.Linq;
using System.Collections.Generic;

public class Test
{
    

	public static void Main()
	{
          var strings = @"xxxRed
xxxYellow
xxxxCareful with that axe Eugene!
xxxxxxdedicum aceasta frumoasa Melodia
xxxxLeaders
xxxxWorking Around - titles
XXXXXNothing To Fear
xxxxAvoiding standards
xxxFirst Aid";
            List<string> lstTitles = strings.Split(new[]{Environment.NewLine}, StringSplitOptions.RemoveEmptyEntries).ToList();
        Console.WriteLine("Before:");
        foreach(var str in lstTitles)
            Console.WriteLine(str);
            lstTitles.RemoveAll(s => s.TrimStart().StartsWith("x", StringComparison.OrdinalIgnoreCase));
        Console.WriteLine("------------------------");
        Console.WriteLine("After:");
        foreach(var str in lstTitles)
            Console.WriteLine(str);
	}
}