#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define ull unsigned ll
#define F first
#define S second
#define mp make_pair
#define pb push_back
#define div codeforces

using namespace std;

const int MIN = 2e3 + 2;
const int MXN = 3e5 + 2;
const int INF = 1e9 + 7;
const ll LINF = 1e18 + 15;
const double EPS = 1e-9;

int n, ans = 4;
string st, s = "!@#$%^&*()-+";

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    //freopen ("abay.in", "r", stdin);
    //freopen ("abay.out", "w", stdout);
    cin >> n >> st;
    for (int i = 0; i < st.size(); ++i){
        if (isdigit(st[i])){
            ans--;
            break;
        }
    }
    for (int i = 0; i < st.size(); ++i){
        if (isupper(st[i])){
            ans--;
            break;
        }
    }
    for (int i = 0; i < st.size(); ++i){
        if (islower(st[i])){
            ans--;
            break;
        }
    }
    for (int i = 0; i < st.size(); ++i){
        bool ok = 1;
        for (int j = 0; j < s.size(); ++j){
            if (s[j] == st[i]){
                ans--;
                ok = 0;
                break;
            }
        }
        if (!ok){
            break;
        }
    }
    cout << max (0, max (ans, 6 - n));
    return 0;
}