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) 
    {
        int answer = 0;
        
        
        boolean hasDig = false;
        for(int i = 0; i < n; i++)
        {
            char ch = password.charAt(i);
            if(Character.isDigit(ch))
            {
                hasDig = true;
            }
            

        }
        if(hasDig == false)
        {
            answer = answer + 1;
        }//digit check
        
        
        boolean hasLow = false;
        for(int i = 0; i < n; i++)
        {
            char ch = password.charAt(i);
            if(Character.isLowerCase(ch))
            {
                hasLow = true;
            }
            

        }
        if(hasLow == false)
        {
            answer = answer + 1;
        }//check low
        
        
        boolean hasUp = false;
        for(int i = 0; i < n; i++)
        {
            char ch = password.charAt(i);
            if(Character.isUpperCase(ch))
            {
                hasUp = true;
            }
            

        }
        if(hasUp == false)
        {
            answer = answer + 1;
        }//check Upper
        
        
        boolean hasSpe = false;
        for(int i = 0; i < n; i++)
        {
            char ch = password.charAt(i);
            if((ch=='!') || (ch == '@') || (ch=='#') || (ch == '$') || (ch=='%') || (ch == '^') || (ch=='&') || (ch == '(') ||                          (ch==')') || (ch == '-')|| (ch=='+'))
            {
                hasSpe = true;
            }
            

        }
        if(hasSpe == false)
        {
            answer = answer + 1;
        }// check Special
        
        
        if(n < 6)
        {
            int num = 6-n;
            if(num > answer)
            {
                answer = answer + (num - answer);
            }
        }
        
        
        return answer;
    }

    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();
    }
}