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) {
        // Return the minimum number of characters to make the password strong
        int ans = 0;
        boolean flag = true;
        for(int i=0;i<n;i++)
        {
            if(password.charAt(i)<='9' && password.charAt(i)>='0')
            {
                flag = false;
                break;
            }
        }
        
        if(flag)
        {
            //System.out.println("1");
            ans+=1;
        }
        
        flag = true;
        for(int i=0;i<n;i++)
        {
            if(password.charAt(i)<='Z' && password.charAt(i)>='A')
            {
                flag = false;
                break;
            }
        }
        
        if(flag)
        {
            //System.out.println("2");
            ans+=1;
        }
        
        flag = true;
        for(int i=0;i<n;i++)
        {
            if(password.charAt(i)<='z' && password.charAt(i)>='a')
            {
                flag = false;
                break;
            }
        }
        
        if(flag)
        {
            //System.out.println("3");
            ans+=1;
        }
        
        flag = true;
        for(int i=0;i<n;i++)
        {
            if(password.charAt(i)=='!' || password.charAt(i)=='@' || password.charAt(i)=='#' || password.charAt(i)=='$' || password.charAt(i)=='%'|| password.charAt(i)=='^' || password.charAt(i)=='&' || password.charAt(i)=='*' || password.charAt(i)=='(' || password.charAt(i)==')' || password.charAt(i)=='+' || password.charAt(i)=='-')
            {
                flag = false;
                break;
            }
        }
        
        if(flag)
        {
            //System.out.println("4");
            ans+=1;
        }
        
        if(ans+n<6)
        {
            //System.out.println("5");
            ans += 6-(ans+n);
        }
        
        return ans;
        
    }

    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();
    }
}