using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
class Solution {

    static int minimumNumber(int n, string password) {
        // Return the minimum number of characters to make the password strong
        string
            numbers = "[0123456789]",
            lower_case = "[abcdefghijklmnopqrstuvwxyz]",
            upper_case = "[ABCDEFGHIJKLMNOPQRSTUVWXYZ]",
            special_characters = @"[!@#$%^&*()\-+]";

        int charsToAdd = 0;

        if (!Regex.IsMatch(password, numbers)) charsToAdd++;
        if (!Regex.IsMatch(password, lower_case)) charsToAdd++;
        if (!Regex.IsMatch(password, upper_case)) charsToAdd++;
        if (!Regex.IsMatch(password, special_characters)) charsToAdd++;

        if (n + charsToAdd < 6) charsToAdd = 6 - n;

        return charsToAdd;
    }

    static void Main(String[] args) {
        int n = Convert.ToInt32(Console.ReadLine());
        string password = Console.ReadLine();
        int answer = minimumNumber(n, password);
        Console.WriteLine(answer);
    }
}