#include <bits/stdc++.h>

using namespace std;

int minimumNumber(int n, string password) {
    int count = 0;
    bool uc = false;
    bool lc = false;
    bool sp = false;
    bool no = false;
    
    set<char> sp_s = {'!','@','#','$','%','^','&','*','(',')','-','+','"'};
    
    for (int i = 0; i < password.length(); i++){
        if ((password[i] >= 'a') && (password[i] <= 'z')) lc = true;
        if ((password[i] >= 'A') && (password[i] <= 'Z')) uc = true;
        if ((password[i] >= '0') && (password[i] <= '9')) no = true;
        if (sp_s.find(password[i]) != sp_s.end()) sp = true;
    }
        
    if (!lc) count++;
    if (!uc) count++;
    if (!no) count++;
    if (!sp) count++;
    
    while ((n + count) < 6) count++;
    
    return count;
    
    // 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;
}