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

const string numbers = "0123456789";
const string lower = "abcdefghijklmnopqrstuvwxyz";
const string upper = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const string special = "!@#$%^&*()-+";

int n;
string s;
bool num, lc, uc, sc;

int main(){
    cin >> n;
    cin >> s;
    num = lc = uc = sc = 0;
    for (int i = 0; i < s.size(); ++i){
        for (int j = 0; j < numbers.size(); ++j) if (s[i] == numbers[j]) num = 1;
        for (int j = 0; j < lower.size(); ++j) if (s[i] == lower[j]) lc = 1;
        for (int j = 0; j < upper.size(); ++j) if (s[i] == upper[j]) uc = 1;
        for (int j = 0; j < special.size(); ++j) if (s[i] == special[j]) sc = 1;
    }
    int ans = !num + !lc + !uc + !sc;
    if (s.size()+ans < 6) ans += 6-s.size()-ans;
    cout << ans << endl;
    return 0;
}