#include <bits/stdc++.h>

using namespace std;

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

        count = password.length();
        if (password.find_first_of(numbers) == std::string::npos) {
            count++;
        }
        if (password.find_first_of(lower_case) == std::string::npos) {
            count++;
        }
        if (password.find_first_of(upper_case) == std::string::npos) {
            count++;
        }
        if (password.find_first_of(special_characters) == std::string::npos) {
            count++;
        }
        
    if (count < 6) {
        return 6 - password.length();
    }
    return count - password.length();
}

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