#include <bits/stdc++.h>
using namespace std;

bool special(char x) {
	char special_characters[15] = "!@#$%^&*()-+";
	for (int i = 0; i < 12; i++) {
		if (x == special_characters[i]) return true;	
	}
	return false;
}

int main() {
	int n;
	char pass[100000];
	scanf("%d", &n); getchar();
	int up = 0, num = 0, spe = 0, lo = 0;
	scanf("%s", pass);
	for (int i = 0; i < n; i++) {
		if (pass[i] >= '0' && pass[i] <= '9') {
			num++;	
		}
		else if (pass[i] >= 'A' && pass[i] <= 'Z') {
			up++;	
		}
		else if (pass[i] >= 'a' && pass[i] <= 'z') {
			lo++;
		}
		else if (special(pass[i])) {
			spe++;	
		}
	}
	int ans = 0;
	if (spe == 0) {
		ans++;
		n++;	
	}
	if (num == 0) {
		ans++;
		n++;	
	}
	if (lo == 0) {
		ans++;
		n++;	
	}
	if (up == 0) {
		ans++;
		n++;	
	}
	if (n < 6) {
		ans += 6-n;	
	}
	printf("%d\n", ans);
	return 0;	
}