#include <bits/stdc++.h>

using namespace std;

int minimumNumber(int n, string s) {int l=0;
 string  numbers = "0123456789",
lower_case = "abcdefghijklmnopqrstuvwxyz",
upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ",
special_characters = "!@#$%^&*()-+";
if(s.find_first_of(numbers)==string::npos)
    n++,l++;
if(s.find_first_of(lower_case)==string::npos)
   n++,l++;
if(s.find_first_of(upper_case)==string::npos)
    n++,l++;
if(s.find_first_of(special_characters)==string::npos)
   n++,l++;                         
 if(n<6) l+=6-n;
  return l;}

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