#include <bits/stdc++.h>

#define pii pair<int, int>
#define f first
#define s second
#define pb push_back
#define mp make_pair
#define ll long long
#define ld long double
#define sz(v) int(v.size())
#define all(v) v.begin(), v.end()
#define vec vector<int>

#define left not_right
#define y1 what

using namespace std;

const int N = (int) 1e3 + 10;
const int M = (int) 2e6 + 7;
const ll LINF = (ll) 1e18;
const double PI = 3.14159265359;
const int INF = (int) 1e6;
const double EPS = (double) 1e-9;

int cnt[4];

int main() {
    #define fn "hockey"
    #ifdef witch
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #else
        //freopen(fn".in", "r", stdin);
        //freopen(fn".out", "w", stdout);
    #endif  
    srand(time(0));
    string a[4], st;
    a[0] = "0123456789";
    a[1] = "abcdefghijklmnopqrstuvwxyz";
    a[2] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    a[3] = "!@#$%^&*()-+";
    int n, ans = 0;
    cin >> n >> st;
        for (int id = 0; id < 4; id++) {
            for (auto i : a[id]) {
                for (auto it : st) {
                    if (i == it) cnt[id]++;
                }    
            }
            if (cnt[id] == 0) ans++; 
        }
        n += ans;
    if (n < 6) ans += 6 - n;
    cout << ans;
    return 0;
}