using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;                  

using static System.Globalization.DateTimeFormatInfo;

public class Program

{

    public static void Main()

    {

        var stringContainers = Helpers.RangeDetails(Helpers.MonthNames());

        StringBuilder builder = new();

        foreach (var container in stringContainers)

        {

            builder.AppendLine($"{container.Value,-12} {container.StartIndex,-6} {container.EndIndex, -7}{container.MonthIndex}");

        }

​

        Console.WriteLine("Month        Start  End    Month Index");

        Console.WriteLine("             range  range  index");

        Console.WriteLine(builder);

    }

}

public class Container<T>

{

    public T Value { get; set; }

    public Index StartIndex { get; set; }

    public int MonthIndex { get; set; }

    public Index EndIndex { get; set; }

}

class Helpers

{

    public static List<string> MonthNames()

        => CurrentInfo!.MonthNames[..^1].ToList();

​

    public static List<Container<T>> RangeDetails<T>(List<T> list)

    {

        var elementsList = list.Select((element, index) => new Container<T>

        {

            Value = element,

            StartIndex = new Index(index),

            EndIndex = new Index(Enumerable.Range(0, list.Count)

                .Reverse().ToList()[index], true),

            MonthIndex = index +1

        }).ToList();

​

        return elementsList;

    }

}