import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    static int minimumNumber(int n, String password) {
        List<String> mustentries = new ArrayList<>();
       mustentries.add("0123456789");
       mustentries.add("abcdefghijklmnopqrstuvwxyz");
      mustentries.add("ABCDEFGHIJKLMNOPQRSTUVWXYZ");
       mustentries.add("!@#$%^&*()-+");
      int count = 0;
        for(String s: mustentries) {
            if(!stringContains(password,s.split(""))) {
                count++;
            }
        }
        if (n+count <6) {
            count = count + (6- (n+count));
        }
        
          return count;
    }

    static boolean stringContains(String inputStr, String[] items) {
       return Arrays.stream(items).parallel().anyMatch(inputStr::contains);
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        String password = in.next();
        int answer = minimumNumber(n, password);
        System.out.println(answer);
        in.close();
    }
}