using System;

using System.Linq;

using System.Collections.Generic;

using System.Text.RegularExpressions;

public class Program

{

    public class Item

    {

        public int Id { get; set; }

        public int Val { get; set; }

    }

    public static void Main()

    {

        var list = new List<Item>(){

            new Item{ Id = 1, Val = 0 },

            new Item{ Id = 2, Val = 0 },

            new Item{ Id = 3, Val = 1 },

            new Item{ Id = 4, Val = 1 },

            new Item{ Id = 5, Val = 1 },

            new Item{ Id = 6, Val = 1 },

            new Item{ Id = 7, Val = 0 },

            new Item{ Id = 8, Val = 0 },

            new Item{ Id = 9, Val = 0 },

            new Item{ Id = 10, Val = 0 },

            new Item{ Id = 11, Val = 1 },

            new Item{ Id = 12, Val = 1 },

            new Item{ Id = 13, Val = 0 },

            new Item{ Id = 14, Val = 0 },

        };

        var prev = 0;

        List<int> bag = null;

        var result = new List<List<int>>();

        foreach(var item in list)

        {

            if(item.Val == 1)

            {

                if(prev == 0)

                {

                    if(bag != null)

                        result.Add(bag);

                    bag = new List<int>();

                }                       

                bag.Add(item.Id);

            }

            prev = item.Val;

        }

        if(bag != null)

            result.Add(bag);

        result.ForEach(x => {           

            Console.WriteLine(String.Join(", ", x));

        });

    }

}