using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter the text");

        String input = Console.ReadLine();

        int output=0;

        foreach(char c in input)

        {

            //Converting each character of string to int ascii value and comparing with A-Z and a-z ascii values

            int ascii = Convert.ToInt32(c);

            //counting those char with needed ascii value

            if(ascii>=97 && ascii<=122)

            {

                output++;

            }

            if(ascii>=65 && ascii<=90)

            {

                output++;

            }

        }

        Console.WriteLine(output+" Letters");

    }

}