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

#define fr freopen("in.txt", "r", stdin);
#define fw freopen("out.txt", "w", stdout);
#define sd(x) scanf("%d", &x);
#define sl(x) scanf("%lld", &x);
#define sf(x) scanf("%lf", &x);
#define ll long long
#define ull unsigned long long
#define F first
#define S second
#define mem(v, x) memset(v, x, sizeof(v));
#define EB emplace_back
#define PB push_back
#define MP make_pair

int main()
{
	//fr;
	//fw;

	string UC = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	string LC = "abcdefghijklmnopqrstuvwxyz";
	string N = "0123456789";
	string SC = "!@#$%^&*()-+";

	int l;
	sd(l);

	string pass;
	cin >> pass;

	int res = 0;
	bool ok = 0;

	for (int x = 0; x < UC.size(); x++)
	{
		for (int y = 0; y < pass.size(); y++)
		{
			if (pass[y] == UC[x])
				ok = 1;
		}
	}

	if (!ok)
		res++;

	ok = 0;

	for (int x = 0; x < LC.size(); x++)
	{
		for (int y = 0; y < pass.size(); y++)
		{
			if (pass[y] == LC[x])
				ok = 1;
		}
	}

	if (!ok)
		res++;

	ok = 0;

	for (int x = 0; x < N.size(); x++)
	{
		for (int y = 0; y < pass.size(); y++)
		{
			if (pass[y] == N[x])
				ok = 1;
		}
	}

	if (!ok)
		res++;

	ok = 0;

	for (int x = 0; x < SC.size(); x++)
	{
		for (int y = 0; y < pass.size(); y++)
		{
			if (pass[y] == SC[x])
				ok = 1;
		}
	}

	if (!ok)
		res++;

	printf("%d", res + max(0, 6 - l - res));
}