#include <bits/stdc++.h>

using namespace std;

int minimumNumber(int n, string password) {
    string numbers = "0123456789",
lower_case = "abcdefghijklmnopqrstuvwxyz",
upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ",
special_characters = "!@#$%^&*()-+";
    int num=1, lc=1, uc=1, sc=1;
    for(int i = 0; i < n; i++){
        for(int j = 0;j<numbers.size();j++ )
        {
            if(numbers[j]==password[i])
            {
                num = 0;
                break;
            }
        }
        if(num == 0) break;
    }
    for(int i = 0; i < n; i++){
        for(int j = 0;j<lower_case.size();j++ )
        {
            if(lower_case[j]==password[i])
            {
                lc = 0;
                break;
            }
        }
        if(lc == 0) break;
    }
    for(int i = 0; i < n; i++){
        for(int j = 0;j<upper_case.size();j++ )
        {
            if(upper_case[j]==password[i])
            {
                uc = 0;
                break;
            }
        }
        if(uc == 0) break;
    }
    for(int i = 0; i < n; i++){
        for(int j = 0;j<special_characters.size();j++ )
        {
            if(special_characters[j]==password[i])
            {
                sc = 0;
                break;
            }
        }
        if(sc == 0) break;
    }
    if(n>=6)
    {
        return(lc+uc+num+sc);
    }    
    else
    {
        if(lc+uc+num+sc+n>=6)
            return(lc+uc+num+sc);
        else
            return(6-n);
    }
    
    
    
    // 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;
}