using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        LinkedList<int> numList = new LinkedList<int>();

        Console.Write("Enter length of the list: ");

        int n = int.Parse(Console.ReadLine());

        int number;

        for(int i =1 ; i <=n; i++)

        {

            Console.Write("number {0} = ", i);

            number = int.Parse(Console.ReadLine());

            numList.AddLast(number);

        }

        Console.WriteLine();

        Console.WriteLine("Printing all numbers in the list");

        foreach(var el in numList)

            Console.Write("{0} ", el);

        Console.WriteLine();

        numList.AddAfter(numList.First,0);

        Console.WriteLine("After adding 0 after the first element: ");

        foreach(var el in numList)

            Console.Write("{0} ", el);

        Console.WriteLine();

        LinkedListNode<int> node = numList.First;

        LinkedListNode<int> nodeEven = null;

        while(node != null)

        {

            if (node.Value % 2 != 0 )

            {

                nodeEven = node;

                break;

            }

            node  = node.Next;

        }

        if(nodeEven != null)

        {

            numList.AddAfter(numList.First,0);

            Console.WriteLine("After adding 0 after the first uneven");

            foreach(var el in numList)

                Console.Write("{0} ", el);

        }

        else    

            Console.WriteLine("There aren't even elements");

    }

}