using System;

public class Program

{

    const int GRADE_A = 90;

    const int GRADE_B = 80;

    const int GRADE_C = 70;

    const int GRADE_D = 60;

    const int GRADE_F = 59;

    public static void Main()

    {

        try

        {   

            double dblGradeA = 93;

            int intGRADE_A = int.Parse(dblGradeA.ToString());

            double dblGradeB = 87;

            int intGRADE_B = int.Parse(dblGradeB.ToString());

            double dblGradeC = 75;

            int intGRADE_C = int.Parse(dblGradeC.ToString());

            double dblGradeD = 61;

            int intGRADE_D = int.Parse(dblGradeD.ToString());

            double dblGradeF = 54;

            int intGRADE_F = int.Parse(dblGradeF.ToString());

    if(dblGradeA >= GRADE_A)

    {

        Console.WriteLine("A grade of " + dblGradeA + " is an A");      

    }

    else

    {

        Console.WriteLine();

    }

    if(dblGradeB >= GRADE_B)

    {

        Console.WriteLine("A grade of " + dblGradeB + " is a B");       

    }

    else

    {

        Console.WriteLine(dblGradeB + "Less than " + GRADE_A );

    }

    if(dblGradeC >= GRADE_C)

    {

        Console.WriteLine("A grade of " + dblGradeC + " is a C");       

    }

    else

    {

        Console.WriteLine(dblGradeC + "Less than " + GRADE_B);

    }

    if(dblGradeD >= GRADE_D)

    {

        Console.WriteLine("A grade of " + dblGradeD + " is a D");       

    }

    else

    {

        Console.WriteLine(dblGradeD + "Less than " + GRADE_C);

    }

    if(dblGradeF <= GRADE_F)

    {

        Console.WriteLine("A grade of " + dblGradeF + " is an F");      

    }

    else

    {

    }

        }

        catch (Exception)

        {

            throw;

        }

        Console.WriteLine("");

    }

}