#include <bits/stdc++.h>

using namespace std;

int minimumNumber(int n, string password) {
    // Return the minimum number of characters to make the password strong
    int count=0;
    int c=0;
    int c1=0;
    int c2=0;
    int c3=0;

    string numbers = "0123456789";
    string lower_case = "abcdefghijklmnopqrstuvwxyz";
    string upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    string special_characters = "!@#$%^&*()-+";
    for(int i=0;i<10;i++){
        char a= numbers[i];
        if(password.find(numbers[i]) != std::string::npos){
            c=1;
            break;
        }
    }
    if(c!=1)
        count ++;
    //cout << count << endl;
        
    for(int i=0;i<26;i++){
                char a= lower_case[i];

        if(password.find(lower_case[i]) != std::string::npos){
            c1=1;
            break;
        }
    }
    if(c1!=1)
        count ++;
        //cout << count << endl;

    for(int i=0;i<26;i++){
                        char a= upper_case[i];

        if(password.find(upper_case[i]) != std::string::npos){
            c2=1;
            break;
        }
    }
    if(c2!=1)
        count ++;
       // cout << count << endl;

    for(int i=0;i<12;i++){
                        char a= special_characters[i];

        if(password.find(special_characters[i]) != std::string::npos){
            c3=1;
            break;
        }
    }
    if(c3!=1)
        count ++;
        //cout << count << endl;

    if(n+count < 6)
        count = count + 6-(n+count);
    return count;
        

}

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