#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 = "!@#$%^&*()-+";
    
    int minNumber = 0;
    
    int i = 0;
    //Check if contain atleast one digit
    for(i = 0; i<numbers.size(); i++ ) {
        if(password.find(numbers[i])!=string::npos) {
            break;
        }
    }
    
    if(i==numbers.size()) minNumber++;
    
    //Check if contain atleast lower_case
    for(i = 0; i<lower_case.size(); i++ ) {
        if(password.find(lower_case[i])!=string::npos) {
            break;
        }
    }
    if(i==lower_case.size()) minNumber++;
    
    //Check if contain atleast upper_case
    for(i = 0; i<upper_case.size(); i++ ) {
        if(password.find(upper_case[i])!=string::npos) {
            break;
        }
    }
    if(i==upper_case.size()) minNumber++;
    
     //Check if contain atleast special_characters
    for(i = 0; i<special_characters.size(); i++ ) {
        if(password.find(special_characters[i])!=string::npos) {
            break;
        }
    }
    if(i==special_characters.size()) minNumber++;
    
    
   
    if( (minNumber + password.size()) >= 6 ) {
        return minNumber;
    }
    return minNumber + 6 - (minNumber + password.size());
    //return minNumber;
    
    
    // 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;
}