#include <bits/stdc++.h>

using namespace std;

int minimumNumber(int n, string password) {
    // Return the minimum number of characters to make the password strong
    int i;
    int C,c,s,d,ex;
    C=c=s=d=1;
    ex=0;
    for(i=0;i<n;i++){
        if(isalnum(password[i])){
        if(isdigit(password[i])){
            d=0;
        }
        else if(isalpha(password[i])){
            if(isupper(password[i]))C=0;
            else c=0;
        }
        }
        else if(ispunct(password[i])){
            s=0;
        }
    }
    n=n + c+C+d+s;
    if(n<6)ex=6-n;
    //cout << c<<C<<d<<s<<ex;
    return ex+c+C+d+s;
}

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