#include <bits/stdc++.h>

using namespace std;

string sp = "!@#$%^&*()-+";

int n;
string str;

int main(){
	cin >> n;
	cin >> str;
	int a = 1;
	int b = 1;
	int c = 1;
	int d = 1;
	for(auto u : str){
		if(u >= 'a' && u <= 'z') a = 0;
		if(u >= 'A' && u <= 'Z') b = 0;
		if(u >= '0' && u <= '9') c = 0;
		for(auto f : sp){
			if(u == f) d = 0;
		}
	}
    int ans = max(6 - n, a + b + c + d);
    cout << ans << endl;
	return 0;
}