#include <algorithm>
#include <cstddef>
#include <functional>
#include <iostream>
#include <iterator>
#include <list>
#include <queue>
#include <set>
#include <string>
#include <vector>
#include <utility>

using namespace std;

bool Includes(const string& x1, const string& x2)
{
	for (auto character : x1)
	{
		for (auto ch : x2)
		{
			if (character == ch)
				return true;
		}
	}

	return false;
}

void Compute()
{
	using namespace std;
	cin.sync_with_stdio(false);

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

	size_t length;
	cin >> length;

	string password;
	cin >> password;

	// It contains at least one digit:
	size_t toAdd = 0;
	if (!Includes(password, numbers))
	{
		++toAdd;
	}
	if (!Includes(password, lower_case))
	{
		++toAdd;
	}
	if (!Includes(password, upper_case))
	{
		++toAdd;
	}
	if (!Includes(password, special_characters))
	{
		++toAdd;
	}

	if (password.size() < 6)
		toAdd = std::max(6 - password.size(), toAdd);

	cout << toAdd << endl;
}

#if !defined(TEST)
int main()
{
	Compute();
	return 0;
}
#endif