using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        int[] grades = { 59, 82, 70, 56, 92, 98, 85 };

​

        IEnumerable<int> lowerGrades =

            grades

            // .OrderByDescending(grade => grade)

            .SkipWhile(grade => grade >= 80);

​

        Console.WriteLine("All grades below 80:");

        foreach (int grade in lowerGrades)

        {

            Console.WriteLine(grade);

        }

    }

}