using System;
using System.Collections.Generic;
public class Program
{
public static void Main()
{
string[] arr = { "python", "c#", "php", "nodejs", "java", "c", "c++" };
LinkedList<string> ll = new LinkedList<string>(arr);
LinkedListNode<string> current = ll.Find("php");
Console.WriteLine(current.Previous.Value);
Console.WriteLine(current.Next.Value);
}
}
/*
run:
c#
nodejs
*/