#include <bits/stdc++.h>

using namespace std;

int minimumNumber(int n, string str) {
    // Return the minimum number of characters to make the password strong
    
    int add = 0 ;
    int flag = 1;
    
    for ( int i = 0 ;i < n ; i ++){
        if ( str[i] >= 65 && str[i] <= 90 ){
            flag = 0 ;
            //cout << "A";
            break;
            
        }
    }
    add = (flag) ? add + 1 : add ;
    
    flag = 1;
    for ( int i = 0 ;i < n ; i ++){
        if ( str[i] >= 97 && str[i] <= 122 ){
            flag = 0 ;
            //cout << "a";
            break;
            
        }
    }
    add = (flag) ? add + 1 : add ;
    
    flag = 1;
    
    /*regex e ("^(?=.*?[A-Z])(?=.*?[a-z])(?=.*?[0-9])(?=.*?[!@#$%^&*()-+]).{6,}$");
    if(!regex_match (str,e))
        add += 1;
        !@#$%^&*()-+
    */
    for ( int i = 0 ;i < n ; i ++){
        if ( str[i] >= 33 && str[i] <= 45 && str[i] != 34 && str[i] != 39 && str[i] != 44){
            flag = 0 ;
            break;
        }
    }
    add = (flag) ? add + 1 : add ;
    
    flag = 1;
    for ( int i = 0 ;i < n ; i ++){
        if ( str[i] >= 48 && str[i] <= 57 ){
            flag = 0 ;
            //cout << "1";
            break;
            
        }
    }
    add = (flag) ? add + 1 : add ;
    
    if ( str.size() + add < 6)
        return add + 6 - (str.size() + add);
    else 
        return add ;
    
}

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