using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

         string input = "PECVD_XL_XT_6_1_B9_PATCH.2".ToLower();

         List<string> tokens = input.Split('_').ToList();

         int buildIndex = tokens.FindIndex(s => s.StartsWith('b'));

         if(buildIndex >= 2)

         {

            List<string> releaseParts = tokens.GetRange(buildIndex - 2, 2);

            string release = string.Join("_", releaseParts);

            string build = tokens[buildIndex].TrimStart('b');

            int patchIndex = input.LastIndexOf('.');

            string patchNumber = patchIndex >= 0

                ? input.Substring(++patchIndex) : null;

             Console.WriteLine($"Release: {release} Build: {build} PatchNumber: {patchNumber}");

         }

    }

}