#include <bits/stdc++.h>

using namespace std;

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

bool check(string a, string b) {
	for (char u : a) {
		if (b.find(u) < b.size()) {
			return 1;
		}
	}
	return 0;
}

int main() {
	int n;
	cin >> n;
	string s;
	cin >> s;
	int m = n;
	if (!check(s, numbers)) m++;
	if (!check(s, lower_case)) m++;
	if (!check(s, upper_case)) m++;
	if (!check(s, special_characters)) m++;
	if (m < 6) {
		m = 6;
	}
	cout << m - n << endl;
	return 0;
}