#include <bits/stdc++.h>

using namespace std;

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

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