#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    string s;
    
    cin >> n;
    cin >> s;
    
    string spe = "!@#$%^&*()-+";
    bool isNum = false;
    bool isLower = false;
    bool isUpper = false;
    bool isSpe = false;
    int ans = 0;
    
    int i, len = s.size();
    int j, lenJ = spe.size();
    
    for (i = 0; i < len; i++) {
        if ('0' <= s[i] && s[i] <= '9') isNum = true;
        else if ('a' <= s[i] && s[i] <= 'z') isLower = true;
        else if ('A' <= s[i] && s[i] <= 'Z') isUpper = true;
        else {
            for (j = 0; j < lenJ; j++) {
                if (s[i] == spe[j]) {
                    isSpe = true;
                    
                    break;
                }
            }
        }
    }
    
    if (!isNum) ans++;
    if (!isLower) ans++;
    if (!isUpper) ans++;
    if (!isSpe) ans++;
    
    if (s.size() + ans < 6) ans += 6 - (s.size() + ans);
    
    cout << ans << '\n';
    
    return 0;
}