#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <cstring>
using namespace std;


int main() {
	bool l = 0, u = 0, n = 0, s = 0;
	int num;
	char* ch = new char[2];
	ch[1] = '\0';
	const char* numbers = "0123456789";
	const char* lower_case = "abcdefghijklmnopqrstuvwxyz";
	const char* upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	const char* special_characters = "!@#$%^&*()-+";
	cin >> num;

	int res = 0;
	for (int i = 0; i < num; i++)
	{
		cin >> ch[0];
		if (strstr(numbers, ch)) n = true;
		if (strstr(lower_case, ch)) l = true;
		if (strstr(upper_case, ch)) u = true;
		if (strstr(special_characters, ch)) s = true;
	}
	if (n == false) res++;
	if (l == false) res++;
	if (u == false) res++;
	if (s == false) res++;
	cout << ((num + res < 6) ? (6 - num) : res);

	return 0;
}