#include <bits/stdc++.h>
using namespace std;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    string numbers = "0123456789";
    string lower_case = "abcdefghijklmnopqrstuvwxyz";
    string upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    string special_characters = "!@#$%^&*()-+";
    set<char> sp(special_characters.begin(), special_characters.end());

    int n;
    cin >> n;
    // for (int i = 0; i < n; i++) {
        string s;
        cin >> s;
        
        int m = 0;
        if (s.size() < 6) {
            m = max(m, 6 - (int)s.size());
        }
        bool a = false;
        bool b = false;
        bool c = false;
        bool d = false;
        for (char ch : s) {
            if ('a' <= ch && ch <= 'z')
                a = true;
            if ('A' <= ch && ch <= 'Z')
                b = true;
            if ('0' <= ch && ch <= '9')
                c = true;
            if (sp.count(ch))
                d = true;
        }
        m = max(m, (!a) + (!b) + (!c) + (!d));
        cout << m << '\n';
    // }
}