#include <bits/stdc++.h>
#include <iostream>       // std::cout
#include <string>      

using namespace std;

int minimumNumber(int n, string password) {
    // Return the minimum number of characters to make the password strong
    string numbers = "0123456789";
    string lower_case = "abcdefghijklmnopqrstuvwxyz";
    string upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    string special_characters = "!@#$%^&*()-+";
    int counter = 0;
    for (int i = 0; i < numbers.size(); i++)
    {
        size_t found = password.find(numbers[i]);
        if (found!=string::npos)
        {
            break;
        }
        if (i == numbers.size()-1){counter++;}    
    }
    for (int i = 0; i < lower_case.size(); i++)
    {
        size_t found = password.find(lower_case[i]);
        if (found!=string::npos)
        {
            break;
        }
        if (i == lower_case.size()-1){counter++;}    
    }
    for (int i = 0; i < upper_case.size(); i++)
    {
        size_t found = password.find(upper_case[i]);
        if (found!=string::npos)
        {
            break;
        }
        if (i == upper_case.size()-1){counter++;}    
    }
    for (int i = 0; i < special_characters.size(); i++)
    {
        size_t found = password.find(special_characters[i]);
        if (found!=string::npos)
        {
            break;
        } 
        if (i == special_characters.size()-1){counter++;}
    }
    if (n + counter > 6 ){ return counter;} 
    else{return 6-n;}
        
}

int main() {
    int n;
    cin >> n;
    string password;
    cin >> password;
    int answer = minimumNumber(n, password);
    cout << answer << endl;
    return 0;
}