import java.util.Scanner;

/**
 * Created by hp on 02-11-2017.
 */
public class Solution {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        String s=sc.next();
        int len=n;
        int digit=0,lwr=0,upr=0,sp=0;
        for (int i = 0; i <s.length() ; i++) {
            if(s.charAt(i) >=48 && s.charAt(i)<=57){
                digit++;
            }
            else if(s.charAt(i) >=65 && s.charAt(i)<=90)
                upr++;
            else if(s.charAt(i)>=97 && s.charAt(i)<=122)
                lwr++;
            else if(s.charAt(i)=='!' || s.charAt(i) == '@' || s.charAt(i) == '^' ||s.charAt(i) == '%' ||s.charAt(i) == '$' ||s.charAt(i) == '&' ||s.charAt(i) == '*' ||s.charAt(i) == '-' ||s.charAt(i) == '+' ||s.charAt(i) == '(' ||s.charAt(i) == ')'||s.charAt(i) == '#') 
                sp++;
            //!@#$%^&*()-+
        }
        int cnt=0;
        if(digit == 0)
        {
            cnt++;
      //      System.out.println("in");
            len++;

        }
        if(upr == 0)
        {
            cnt++;
       //     System.out.println("in");
            len++;
        }
        if(lwr == 0)
        {
            cnt++;
         //   System.out.println("in");
            len++;
        }

        if(sp == 0)
        {
            cnt++;
            //   System.out.println("in");
            len++;
        }
       // System.out.println("len "+len);


        if(len < 6){
            cnt=cnt+(6-len);
        }
        System.out.println(cnt);
    }
}