#include <bits/stdc++.h>

using namespace std;

int n;

string s;

int ct, ctt, cttt, ctttt, ans;

int main() {
    cin >> n;
    cin >> s;
    for (int i = 0; i < n; ++i) {
        if (s[i] >= '0' && s[i] <= '9') {
            ct = 1;
        }
        else if (s[i] >= 'a' && s[i] <= 'z') {
            ctt = 1;
        }
        else if (s[i] >= 'A' && s[i] <= 'Z') {
            cttt = 1;
        }
        else {
            ctttt = 1;
        }
    }
    if (!ct) {
        s += '0';
        ++ans;
    }
    if (!ctt) {
        s += 'a';
        ++ans;
    }
    if (!cttt) {
        s += 'A';
        ++ans;
    }
    if (!ctttt) {
        s += '%';
        ++ans;
    }
    cout << ans + max(6 - (int)s.size(), 0);
}