using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var tests = new Dictionary<int,string>() {

            {0,"F"},

            {59, "F"},

            {60, "E-"},

            {65, "E"},

            {69, "E+"},

            {70, "D-"},

            {99, "B+"},

            {100, "A"},

            {812, "A"}

        };

        Func<int,string>g=s=>s>99?"A":s<60?"F":(char)(75-s/10)+(s%10<3?"-":s%10>6?"+":"");

        foreach (var test in tests) {

            var result = g(test.Key);

            Console.WriteLine("{0} => {1} -- {2}", test.Key, result, result==test.Value?"pass":"FAIL");

        }

    }

}