#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

int N, L, U, S;
int main() {
    string nu = "0123456789";
    string lc = "abcdefghijklmnopqrstuvwxyz";
    string uc = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    string sc = "!@#$%^&*()-+";
    
    int n; cin >> n;
    string s; cin >> s;

    
    for (char ch: s) {
        for (char ch2: nu) if (ch == ch2) N = 1;
        for (char ch2: lc) if (ch == ch2) L = 1;
        for (char ch2: uc) if (ch == ch2) U = 1;
        for (char ch2: sc) if (ch == ch2) S = 1;
    }
    int ans = 4 - (N + L + U + S);
    ans += max(6 - n - ans, 0);
    cout << ans << '\n';
    return 0;
}