/*Let's get high :D*/
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
 
#define MOD                 1000000007LL
#define EPS                 1e-9
#define io                  ios_base::sync_with_stdio(false);cin.tie(NULL);
#define M_PI                3.14159265358979323846

template <typename T> T gcd(T a, T b){return (b==0)?a:gcd(b,a%b);}
template <typename T> T lcm(T a, T b){return a*(b/gcd(a,b));}
template <typename T> T mod_exp(T b, T p, T m){T x = 1;while(p){if(p&1)x=(x*b)%m;b=(b*b)%m;p=p>>1;}return x;}
template <typename T> T invFermat(T a, T p){return mod_exp(a, p-2, p);}
template <typename T> T exp(T b, T p){T x = 1;while(p){if(p&1)x=(x*b);b=(b*b);p=p>>1;}return x;}

const int MAXN = 1e5+5;

int main(){
	io;
	int n;
	cin >> n;
	string s;
	cin >> s;
	bool containsDig = false, containsSmall = false, containsUpper = false, containsSpecial = false;
	for(auto i : s){
		if(i >= '0' && i <= '9')
			containsDig = true;
		if(i >= 'a' && i <= 'z')
			containsSmall = true;
		if(i >= 'A' && i <= 'Z')
			containsUpper = true;
		if(i == '!' || i == '@' || i == '#' || i == '$' || i == '%' || i == '^' || i == '&' || i == '*' || i == '(' || i == ')' || i == '-' || i == '+')
			containsSpecial = true;
	}
	int add = 0;
	int l = s.size();
	if(!containsDig){
		add++;
		l++;
	}
	if(!containsSmall){
		add++;
		l++;
	}
	if(!containsUpper){
		add++;
		l++;
	}
	if(!containsSpecial){
		add++;
		l++;
	}
	if(l < 6){
		add += (6-l);
	}
	cout << add << endl;
	return 0;
}