using System;
using System.Text;
using System.Linq;
using System.Collections.Generic;
        
public class Program
{
    
    public enum LogStatus{
            InProgress=1, 
            FileNotFound=2,
            Success=3,
            Failed=4 
        }

        class LogDetails
        {
            public string Message;
            public LogStatus LogStatus;
        }

        class Log
        {
            public List<LogDetails> LogDetails;
            public string Title;
        }
        
 
public static void Main(string[] args)
{
    var logs = new List<Log>(){
    new Log{
        Title="A",
        LogDetails=new List<LogDetails>(){
            new LogDetails{
                Message="AA",
                LogStatus = LogStatus.FileNotFound
            },
            new LogDetails{
                Message="AB",
                LogStatus = LogStatus.Success
            },
            new LogDetails{
                Message="AC",
                LogStatus = LogStatus.Failed
            }
        } 
    },
    new Log{
        Title="B",
        LogDetails=new List<LogDetails>(){
            new LogDetails{
                Message="BA",
                LogStatus = LogStatus.InProgress
            },
            new LogDetails{
                Message="BB",
                LogStatus = LogStatus.Success
            }
        } 
    }
};

List<Log> failedLogs = logs
    .Where(l => l.LogDetails.Any(ld => ld.LogStatus==LogStatus.Failed))
    .ToList();
    
    foreach(Log log in failedLogs)
        Console.WriteLine("Failed log found: Title={0} Details={1}"
        , log.Title
        , string.Join(", ",log.LogDetails.Select(d => d.Message).ToArray()));
}
}