#include <bits/stdc++.h>

using namespace std;

int minimumNumber(int n, string password) {
    string numbers = "0123456789";
    string lower_case = "abcdefghijklmnopqrstuvwxyz";
    string upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    string special_characters = "!@#$%^&*()-+";
    
    bool number_flag=false;
    bool lower_flag=false;
    bool upper_flag=false;
    bool special_flag=false;
    
    int counter=0;
    int n_add=4;
    while(!number_flag & counter<10 ){
        std::size_t found1 = password.find(numbers[counter]);
        if (found1!=std::string::npos){
            number_flag=true;
            n_add -= 1;
            //cout << "number" << endl;
        }
        counter++;
    }
    counter=0;
    while(!lower_flag & counter<26){
        std::size_t found1 = password.find(lower_case[counter]);
        if (found1!=std::string::npos){
            lower_flag=true;
            n_add -= 1;
            //cout << "lower" << endl;
        }
        counter++;
    }
    counter=0;
    while(!upper_flag & counter<26){
        std::size_t found1 = password.find(upper_case[counter]);
        if (found1!=std::string::npos){
            upper_flag=true;
            n_add -= 1;  
            //cout << "upper" << endl;
        }
        counter++;
    }
    counter=0;
    while(!special_flag & counter<13){
        std::size_t found1 = password.find(special_characters[counter]);
        if (found1!=std::string::npos){
            special_flag=true;
            n_add -= 1; 
            //cout << "special" << endl;

        }
        counter++;
    }
    return( max( 6 - ((int) password.size() ), n_add));
    
    // Return the minimum number of characters to make the password strong
}

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