#include <bits/stdc++.h>

using namespace std;

int minimumNumber(int n, string p) {
    int digit=1;
    int lower=1,upper=1,special=1;
    string special_characters = "!@#$%^&*()-+";
    for(int i=0; i<n;i++)
    {
        if(p[i]>=48 && p[i]<=57) digit=0;
        if(p[i]>=97 && p[i]<=122) lower=0;
        if(p[i]>=65 && p[i]<=90) upper=0;
        for(int j=0; j<special_characters.size(); j++)
            if(p[i]==special_characters[j])
                special=0;
        
        
    }
    if(digit+lower+special+upper+n<=6) return 6-n;
    else return digit+lower+special+upper;
}

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