#include <bits/stdc++.h>


using namespace std;


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

int main() {
	string s;
	int l;
	cin >> l;
	cin >> s;
	int count=4;
	bool check=true;
	for(int i=0;i<s.length();i++){
		for (int j = 0; j < 10; ++j)
		{
			if(s[i]==numbers[j]){
				count--;
				check=false;
				break;
			}
		}
		if(!check)
			break;
	}
	if(check)
		l++;
	check=true;
	for(int i=0;i<s.length();i++){
		for (int j = 0; j < 26; ++j)
		{
			if(s[i]==lower_case[j]){
				count--;
				check=false;
				break;
			}
		}
		if(!check)
			break;
	}

	if(check)
		l++;
	check=true;
	for(int i=0;i<s.length();i++){
		for (int j = 0; j < 26; ++j)
		{
			if(s[i]==upper_case[j]){
				count--;
				check=false;
				break;
			}
		}
		if(!check)
			break;
	}

	if(check)
		l++;
	check=true;
	for(int i=0;i<s.length();i++){
		for (int j = 0; j < special_characters.length(); ++j)
		{
			if(s[i]==special_characters[j]){
				count--;
				check=false;
				break;
			}
		}
		if(!check)
			break;
	}
	if(check)
		l++;

	if(l<6)
		count+=(6-l);
	cout << count;



}