using System;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Pleasr enter your original score.");
            int score = int.Parse(Console.ReadLine());
            if (score >100 || score <70)
                Console.WriteLine("Out of range!!");
            else if(score >= 90)
                Console.WriteLine("A+");
            else if (score >= 85)
                Console.WriteLine("A");
            else if (score >= 80)
                Console.WriteLine("A-");
            else if (score >= 77)
                Console.WriteLine("B+");
            else if (score >= 73)
                Console.WriteLine("B");
            else if (score >= 70)
                Console.WriteLine("B-");

        }
    }
}