import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
public class Solution 
{
    public static void main(String[] args) 
    {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        String s = in.next();
        int l=s.length();
        int a,c=0,d=0,e=0,f=0,ans=0;
        for(a=0;a<s.length();a++)
        {
           if(s.charAt(a)>=48 && s.charAt(a)<=57)
           {
                c++;                   
           }
           else if(s.charAt(a)>=65 && s.charAt(a)<=90)
           {
               d++;
           }
           else if(s.charAt(a)>=97 && s.charAt(a)<=122)
           {
               e++;
           }
            else if(s.charAt(a)==33 || s.charAt(a)==35 || s.charAt(a)==40 || s.charAt(a)==33 || s.charAt(a)==36 || s.charAt(a)==37 ||s.charAt(a)==94 || s.charAt(a)=='&' || s.charAt(a)=='*' || s.charAt(a)=='(' && s.charAt(a)==')' || s.charAt(a)=='-' || s.charAt(a)=='+')
            {
                f++;
            }
        }
        if(c==0)
        {
            ans++;
        }
        if(d==0)
        {
            ans++;
        }
        if(e==0)
        {
            ans++;
        }
        if(f==0)
        {
            ans++;
        }
        if(s.length()<6 && (6-s.length())<=ans)
        {
            System.out.print(ans);
        }
        else if(s.length()<6 && (6-s.length())>ans)
        {
            System.out.print(6-s.length());
        }
        else
        {
            System.out.print(ans);
        }
    }
}