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) {
        char ch;
        int i=0,lc=0,uc=0,dg=0,sum=0;
        for(int j=1;j<password.length();j++)
        {
            ch=password.charAt(j);
            c=(int)ch;
            if(c>=65 && c<=90)
                uc++;
            else if(c>=97 &&)c<=122)
                lc++;
            else if(c>=0 && c<=9)
                dg++;
            else if(ch=='!')
                i++;
            else if(ch=='@')
                i++;
            else if(ch=='#')
                i++;
            else if(ch=='$')
                i++;
            else if(ch=='%')
                i++;
            else if(ch=='^')
                i++;
            else if(ch=='&')
                i++;
            else if(ch=='*')
                i++;
            else if(ch=='(')
                i++;
            else if(ch==')')
                i++;
            else if(ch=='-')
                i++;
            else if(ch=='+')
                i++;
            sum=i+lc+uc+dg;
            if(lc>=1 && uc>=1 && dg>=1 && i>=1 && sum>=6)
            {}
            else if(sum<6)
                System.out.println(6-sum)
                
        }
    }

    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();
    }
}