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


int main() {
    int n;
    string s;
    cin >> n >> s;
    bool digit = false, lower = false, upper = false, special = false;
    for (int i = 0; i < n; ++i) {
        if (isdigit(s[i])) {
            digit = true;
        }
        if (islower(s[i])) {
            lower = true;
        }
        if (isupper(s[i])) {
            upper = true;
        }
        const string sch = "!@#$%^&*()-+";
        if (sch.find(s[i]) != string::npos) {
            special = true;
        }
    }
    int rem = max(0, 6 - (int)s.size());
    rem -= !digit + !upper + !lower + !special;
    cout << !digit + !upper + !lower + !special + max(0, rem) << endl;
    return 0;
}