#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 res = 0;
    int digit_found = 1;
    int lower_case_found = 1;
    int upper_case_found = 1;
    int special_character_found = 1;
    int length_addition = 0;
    
    for(int i = 0; i < n; i++){
        if(password[i]>47 && password[i] < 58){
            digit_found = 0;
        }
        if(password[i]>64 && password[i] < 91){
            upper_case_found = 0;
        }
        if(password[i]>96 && password[i] < 123){
            lower_case_found = 0;
        }
        if(password[i]==33||password[i]==64||password[i]==35||password[i]==36||password[i]==37||password[i]==94||password[i]==38||
           password[i]==42||password[i]==40||password[i]==41||password[i]==45||password[i]==43){
            special_character_found = 0;
        }
    }
    
    res = digit_found + upper_case_found + lower_case_found + special_character_found;
    if(n+res<6){length_addition = 6-n-res;}
    
    return res+length_addition;
}

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