#include <bits/stdc++.h>

using namespace std;

string numbers = "0123456789";
string lower_case = "abcdefghijklmnopqrstuvwxyz";
string upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
string special_characters = "!@#$%^&*()-+";

bool specialFind(char c){
    for(int i = 0; i < 12; i++){
        if(special_characters[i] == c){
            return true;
        }
    }
    return false;
}

int minimumNumber(int m, string password) {
    // Return the minimum number of characters to make the password strong
    bool n = false, l = false, u = false, s = false;
    int i = 0;
    while(password[i]){
        if(!n && password[i] >= '0' && password[i] <= '9'){
            n = true;
        }
        if(!l && password[i] >= 'a' && password[i] <= 'z'){
            l = true;
        }
        if(!u && password[i] >= 'A' && password[i] <= 'Z'){
            u = true;
        }
        if(!s && specialFind(password[i])){
            s = true;
        }
        i++;
    }
    int result = 4 - int(n) - int(l) - int(u) - int(s);
    if(result + m < 6){
        result = 6 - m;
    }
    return result;
}

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