using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Linq;
public class MainClass{
public static void Main(){
int[] numbers = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
var query = numbers.First();
Console.WriteLine("The first element in the sequence");
Console.Write(query);
query = numbers.Last();
Console.WriteLine("The last element in the sequence");
Console.Write(query);
Console.WriteLine("The first even element in the sequence");
query = numbers.First(n => n % 2 == 0);
Console.Write(query);
Console.WriteLine("The last even element in the sequence");
query = numbers.Last(n => n % 2 == 0);
Console.Write(query);
}
}