using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var rand = new Random();

        var range = Enumerable.Range(1,10).Select(_ => rand.Next(10));

        var a = MyFilter(new List<int>(){1,2,3,4,5,6,7,8,9,10});

        foreach (int b in range)

        {

            Console.WriteLine(b);

        }

        Console.WriteLine("Hello World");

    }

    public static IEnumerable<int> MyFilter(IEnumerable<int> input)

    {

        var result1 = input.Select(x => x*x).Where(p => p%2 == 0);

        return result1.Where(r => r < 51);

        // todo

    }

}