#include<bits/stdc++.h>
#define amit_839 ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
#define nl '\n'
#define rep(i, n) for (int i = 0; i < (n); i++)

using namespace std;
typedef long long int ll;

inline ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }
inline ll lcm(ll a, ll b) { return (a * b) / gcd(a, b); }


int main() {


	amit_839;
	int n;
	cin >> n;
	string str;
	cin >> str;

	bool a, b, c, d;
	a = b = c = d=0;

	rep(i, str.size()) {
		if (str[i] >= '0' && str[i] <= '9') a = 1;
		if (str[i] >= 'a' && str[i] <= 'z') b = 1;
		if (str[i] >= 'A' && str[i] <= 'Z') c = 1;
		if (str[i] == '!' || str[i] == '@' || str[i] == '#' || str[i] == '$' || str[i] == '%' || str[i] == '^' || str[i] == '&' || str[i] == '*' || str[i] == '('
			|| str[i] == ')' || str[i] == '-' || str[i] == '+'
			) d = 1;
	}

	int ans = 0;
	if (!a) ans++;
	if (!b) ans++;
	if (!c) ans++;
	if (!d) ans++;
	if (str.length()+ans<6) ans+=6-str.length()-ans;
	cout << ans << nl;
	return 0;
}