#include <bits/stdc++.h>

using namespace std;

int minimumNumber(int n, string password) {
    string numbers = "0123456789";
    string lower_case = "abcdefghijklmnopqrstuvwxyz";
    string upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    string special_characters = "!@#$%^&*()-+";
    vector<int>b(4);
    int count = 4;
    for(auto c: password){
        if(!b[0] && isdigit(c)) count--, b[0] = 1;
        if(!b[1] && lower_case.find(c) != string::npos) count--, b[1] = 1;
        if(!b[2] && upper_case.find(c) != string::npos) count--, b[2] = 1;
        if(!b[3] && special_characters.find(c) != string::npos) count--, b[3] = 1;
    }
    if(n + count < 6) count += 6 - (n + count);
    return count;
}

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