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

int main(){
	int n;
	cin>>n;
	
	string numbers = "0123456789";
	string lower_case = "abcdefghijklmnopqrstuvwxyz";
	string upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	string special_characters = "!@#$%^&*()-+";
	
	string s;
	cin>>s;
	int l1 = numbers.size();
	int l2 = lower_case.size();
	int l3 = upper_case.size();
	int l4 = special_characters.size();
	
	int f1 = 1, f2 = 1, f3 = 1, f4 = 1;
	
	for (int i = 0; i < n; i++){
		for (int j = 0; j < l1; j++){
			if (s[i] == numbers[j]){
				f1 = 0;
			}
		}
		
		for (int k = 0; k < l2; k++){
			if (s[i] == lower_case[k]){
				f2 = 0;
			}
		}
		
		for (int m = 0; m < l3; m++){
			if (s[i] == upper_case[m]){
				f3 = 0;
			}
		}
		
		for (int t = 0; t < l4; t++){
			if (s[i] == special_characters[t]){
				f4 = 0;
			}
		}
	}
	
	int ctr = f1 + f2 + f3 + f4;
	if (n + ctr < 6){
		ctr += (6 - (n+ctr));
	}
	cout<<ctr;
	return 0;
}