#include <bits/stdc++.h>

using namespace std;


bool instring(string s,string s2){
    for(int i=0;i<s2.size();i++){
       for(int j=0;j<s.size();j++){
           if(s2[i]==s[j]){
               return true;
           }
       } 
    }
    return false;
}

int minimumNumber(int n, string password) {
      string numbers = "0123456789",
    lower_case = "abcdefghijklmnopqrstuvwxyz",
    upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ",
    special_characters = "!@#$%^&*()-+";
    int result = 0;
    if(!instring(numbers,password))
        result++;
    if(!instring(lower_case,password))
        result++;
    if(!instring(upper_case,password))
        result++;
    if(!instring(special_characters,password))
        result++;
    if(n+result<6)
        result+=6-(n+result);
    return result;
}

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