#include <bits/stdc++.h>

using namespace std;

int minimumNumber(int n, string password) {
    int i=0;
    int f1,f2,f3,f4;
    f1=f2=f3=f4=1;
    for(int i=0;i<n;i++){
        if(isdigit(password[i]))
            f1=0;
        if(islower(password[i]))
            f2=0;
        if(isupper(password[i]))
            f3=0;
        string s = "!@#$%^&*()-+";
        for(int j=0;j<s.size();j++){
            if(password[i]==s[j])
                f4=0;
        }
    }
    if(n>=6)
        return f1+f2+f3+f4;
    else{
        if(n+f1+f2+f3+f4>6)
            return f1+f2+f3+f4;
        else
            return 6-n;
    }
        6-n;
    // Return the minimum number of characters to make the password strong
}

int main() {
    int n;
    cin >> n;
    string password;
    cin >> password;
    int answer = minimumNumber(n, password);
    cout << answer << endl;
    return 0;
}