#include <bits/stdc++.h>

using namespace std;


int hasInt(string password){
    string numbers = "0123456789";
    for(int index = 0;index < password.length();index++){
        for(int row = 0; row < numbers.length(); row++){
            if(password[index] == numbers[row]){
                return 0;
            }
        }
    }
    return 1;
}
int hasLower(string password){
    string lower_case = "abcdefghijklmnopqrstuvwxyz";
    for(int index = 0;index < password.length();index++){
        for(int row = 0; row < lower_case.length(); row++){
            if(password[index] == lower_case[row]){
                return 0;
            }
        }
    }
    return 1;
}
int hasUni(string password){
    string special_characters = "!@#$%^&*()-+";
    for(int index = 0;index < password.length();index++){
        for(int row = 0; row < special_characters.length(); row++){
            if(password[index] == special_characters[row]){
                return 0;
            }
        }
    }
    return 1;
}
int hasUpper(string password){
    string upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    for(int index = 0;index < password.length();index++){
        for(int row = 0; row < upper_case.length(); row++){
            if(password[index] == upper_case[row]){
                return 0;
            }
        }
    }
    return 1;
}
int hasLength(int added,string password){
    if(added + password.length() < 6){
        return 6 - (added + password.length());
    }
    else 
        return 0;
}

int minimumNumber(int n, string password) {
    int extra = 0;
    extra += hasInt(password);
    extra += hasLower(password);
    extra += hasUpper(password);
    extra += hasUni(password);
    extra += hasLength(extra,password);
    
    return extra;
}

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