# pragma GCC optimize("O3")
# include <bits/stdc++.h>
std::pair<int,int> DR[] = {{-1,0},{0,1},{1,0},{0,-1},{-1,1},{-1,-1},{1,1},{1,-1}};
# define maxn 100005
# define ll long long
# define clock (clock() * 1000.0 / CLOCKS_PER_SEC)
# define rc(s) return cout << s,0
# define _ ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
# define db(x) cerr << #x << " = " << x << '\n'
# define pb push_back
# define mp make_pair
# define sz(x) (int)((x).size())
//# define int ll
using namespace std;

int n;
string s;
int a = 1,b = 1,c = 1,d = 1;

int32_t main(){_
    //freopen("input","r",stdin);
	cin >> n;
	cin >> s;
	string numbers = "0123456789";
	string lower_case = "abcdefghijklmnopqrstuvwxyz";
	string upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	string special_characters = "!@#$%^&*()-+";	
	for(auto it : s)
	{
		for(auto it1 : numbers) if(it1 == it) a = 0;
		for(auto it1 : lower_case) if(it1 == it) b = 0;
		for(auto it1 : upper_case) if(it1 == it) c = 0;
		for(auto it1 : special_characters) if(it1 == it) d = 0;
	}
	rc(a + b + c + d + max(0,6 - sz(s) - a - b - c - d));
}