#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

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

bool ContainsOne(const string& word, const string& required) {
    for (char c : required) {
        if (find(word.begin(), word.end(), c) != word.end())
            return true;
    }
    return false;
}

int GetRequired() {
    int length;
    string word;
    cin >> length >> word;
    int required = 0;
    
    required += !ContainsOne(word, numbers);
    required += !ContainsOne(word, lower_case);
    required += !ContainsOne(word, upper_case);
    required += !ContainsOne(word, special_characters);
    
    
    
    if (required + length < 6) {
        required = 6 - length;
    }
    return required;
}

int main() {
    cout << GetRequired() << '\n';
    return 0;
}