#include <bits/stdc++.h>

using namespace std;

bool isspecial(char ch)
{
	switch(ch)
	{
		case '!':
		case '@':
		case '#':
		case '$':
		case '%':
		case '^':
		case '&':
		case '*':
		case '(':
		case ')':
		case '-':
		case '+':
			return true;
			break;
			default:
				return false;
	}
}
int minimumNumber(int n, string s) {
    bool digit=false,lc=false,uc=false,sc=false;
	for(int i=0;i<s.length();i++)
    {
    	if(!digit)
		digit=isdigit(s[i]);
    	if(!lc)
		lc=islower(s[i]);
    	if(!uc)
    	uc=isupper(s[i]);
    	if(!sc)
		sc=isspecial(s[i]);
	}
	//cout<<digit<<' '<<lc<<' '<<uc<<' '<<sc;
	int count=0;
	if(!digit)
	count++;
	if(!lc)
	count++;
	if(!uc)
	count++;
	if(!sc)
	count++;
	if((count+s.length())<6)
	return 6-(count+s.length())+count;
	else
	return count;
}

int main() {
    int n;
    cin >> n;
    string password;
    cin >> password;
    int answer = minimumNumber(n, password);
    cout << answer << endl;
    return 0;
}