using System;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var str = new string[] { "1250a2d5-cd40-4bcc-a979-9d6f2cd62b9fLog.txt", "bdb31966-e3c4-4344-b02c-305c0eb0fa0aLogging.txt" }; //file name are Log.txt and Logging.txt

        var arr = str.Select(s=>s.Substring(36)).Where(s=>s.Any()).ToArray();

        Console.WriteLine(string.Join(" ", arr));

    }

}