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 c1=1;
        int c2=1;
        int c3=1;
        int c4=1;
        for(int i=0;i<s.length();i++){
            if(s.charAt(i)>='0'&&s.charAt(i)<='9')
                c1=0;
            else if(s.charAt(i)>='a'&&s.charAt(i)<='z')
                c2=0;
             else if(s.charAt(i)>='A'&&s.charAt(i)<='Z')
                c3=0;
            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)=='+')
                c4=0;
        }
        int k=s.length();
        int ans=c1+c2+c3+c4;
        k=k+c1+c2+c3+c4;
        if(k<6){
            ans=ans+6-k;
        }
        //System.out.println(c1+" "+c2+" "+c3+" "+c4);
        System.out.println(ans);
          
    }
}