using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        List<int> list_ID = new List<int> (new int[ ] { 1, 2, 3, 4, 5 });

        List<string> list_Position = new List<string> (new string[ ] { "A", "C", "D", "B", "E"});

        string searchKey="D";

        int reqPosition=list_Position.IndexOf(searchKey);

        if(reqPosition!=-1)

        {

            Console.WriteLine("Corresponding Id is {0}",list_ID[reqPosition]);

        }

        else

        Console.WriteLine("Not Found");

    }

}