#include <iostream>

using namespace std;

string speS = "!@#$^&*()-+"; // learn

bool isSpe(char c) {
	if (c == '%') return true;
	for(auto cc : speS) if (c == cc) return true;
	return false;
}

int n; string s;
int main() {
	cin >> n;
	cin >> s;

	int dit = 0, low = 0, up = 0, special = 0;
	for(auto c: s) {
		dit += c >= '0' && c <= '9';
		low += c >= 'a' && c <= 'z';
		up += c >= 'A' && c <= 'Z';
		special += isSpe(c);
	}

	int ness = (dit == 0) + (low == 0) + (up == 0) + (special == 0);
	cout << max(ness, 6 - n);
}