using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var numbers = new List<int>() { 3, 24, 34, 65, 33, 56, 6767};

        var linqResult = LinqFilter(numbers);

        var loopResult = LoopFilter(numbers);

        if (!linqResult) Console.WriteLine("no elements");

        if (!loopResult) Console.WriteLine("no elements");      

    }

    private static bool LinqFilter(List<int> numbers)

    {

        var haveElements = false;

        numbers

            .Where(element => element > 20 && element < 50)

            .ToList()

            .ForEach(element => 

                     { 

                         Console.WriteLine($"{element}");

                         haveElements = true;

                     });

        return haveElements;        

    }

    private static bool LoopFilter(List<int> numbers)

    {

        var haveElements = false;

        foreach (var element in numbers)

        {

            if (element > 20 && element < 50) 

            {

                Console.WriteLine($"{element}");

                haveElements = true;

            }

        }

        return haveElements;

    }

}