using System;

public class Program

{

    public static void Main()

    {

        string[] colors = { "blue", "green", "red", "yellow", "purple", "orange" };

​

        Console.Write("Enter a color: ");

        string userInput = Console.ReadLine().ToLower();

        int index = Array.IndexOf(colors, userInput);

​

        if (index != -1)

        {

            Console.WriteLine(userInput + " is found at index " + index + " in the array.");

        }

        else

        {

            Console.WriteLine(userInput + " is not found in the array.");

        }

    }

}