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

    static int minimumNumber(int n, string password) 
    {
        // Return the minimum number of characters to make the password strong
        int minimumDigits = 0;      
        bool containsDigit = password.Any(c => char.IsDigit(c));
        bool containsUpperCase = password.Any(c => char.IsUpper(c));
        bool containsLowerCase = password.Any(c => char.IsLower(c));
        bool specialCharacter = IsSpecialChar(password);
        if (!containsDigit) minimumDigits++;
        if (!containsUpperCase) minimumDigits++;
        if (!containsLowerCase) minimumDigits++;
        if (!specialCharacter) minimumDigits++;
    
            if (6-(n+minimumDigits) > 0)
                minimumDigits+= 6-(n+minimumDigits);
            return minimumDigits;
        }
    
 public static bool IsSpecialChar(string input)
        {
            string specialChar = @"!@#$%^&*()-+";
            foreach (var item in specialChar)
            {
                if (input.Contains(item)) return true;
            }
            return false;
        }

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