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

int n;
string s,_="!@#$%^&*()-+";

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cin >> n >> s;
	int a=0,b=0,d=0,e=0;
	for (char &c : s){
		a|='0'<=c&&c<='9';
		b|='a'<=c&&c<='z';
		d|='A'<=c&&c<='Z';
		e|=_.find(c)!=string::npos;
	}
	int ans=!a+!b+!d+!e;
	ans+=max(0,6-(n+ans));
	cout << ans << "\n";
}