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

string numbers = "0123456789";
string lower_case = "abcdefghijklmnopqrstuvwxyz";
string upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
string special_characters = "!@#$%^&*()-+";

int main() {
    int n;
    string s;
    cin >> n >> s;
    bool a = false, b = false, e = false, d = false;
    for (char c : s) {
        for (char x : numbers) {
            if (x == c) a = true;
        }
        for (char x : lower_case) {
            if (x == c) b = true;
        }
        for (char x : upper_case) {
            if (x == c) e = true; 
        }
        for (char x : special_characters) {
            if (x == c) d = true;
        }
    }
    int ans = n + !a + !b + !e + !d;
    if (ans < 6) ans = 6;
    cout << ans - n << '\n';
    return 0;
}