#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define MOD 1000000007
#define INF 1e18
#define pi pair<ll,ll>
#define pb push_back
#define F first
#define S second
#define sc(x) scanf("%lld",&x)
int main(){
	string numbers = "0123456789";
	string lower_case = "abcdefghijklmnopqrstuvwxyz";
	string upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	string special_characters = "!@#$%^&*()-+";
	ll n;
	cin>>n;
	string s;
	cin>>s;
	bool b;
	ll ans=0;
	b=false;
	for(int i=0;i<n;i++){
		for(int j=0;j<numbers.length();j++){
			if(s[i]==numbers[j]){
				b=true;
			}
		}
	}
	if(!b){
		ans++;
	}
	b=false;
	for(int i=0;i<n;i++){
		for(int j=0;j<lower_case.length();j++){
			if(s[i]==lower_case[j]){
				b=true;
			}
		}
	}
	if(!b){
		ans++;
	}
	b=false;
	for(int i=0;i<n;i++){
		for(int j=0;j<upper_case.length();j++){
			if(s[i]==upper_case[j]){
				b=true;
			}
		}
	}
	if(!b){
		ans++;
	}
	b=false;
	for(int i=0;i<n;i++){
		for(int j=0;j<special_characters.length();j++){
			if(s[i]==special_characters[j]){
				b=true;
			}
		}
	}
	if(!b){
		ans++;
	}
	// cout<<ans<<endl;
	if(n+ans<6){
		ans+=(6-n-ans);
	}
	cout<<ans<<endl;
}