using System;

public class Program

{

    public static void Main()

    {

        int g=0;

        string c="ABCDEFGHIJKLMNOPQRSTUVWXYZ";

        string a,x;

        for(int i=0;i<26;i++)

        {   

        Console.Write("write the letter "+c[i]+" in lower");

        a=Console.ReadLine();   

            if(a.Length==1)

                {

            x=a.ToUpper();

        if(x[0]==c[i])

        {

        g++;

        }

            }

        }

        Console.WriteLine("Youre grade is:"+g+"/26");

    }

}