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 ob = new Scanner(System.in);
        int l = ob.nextInt();
        ob.nextLine();
        
        String s=ob.nextLine();
        
        int i,j,k,count=0;
        long sum=0L;
     //    !@#$%^&*()-+
        
             int t=0,r=0,v=0,st=0;
             
        for(i = 0; i < l; i++)
        {
        char c=s.charAt(i);
        int p= (int)c;
            
            if(p>=47 && p<=57 )
            {
                r=1;
            }
            if(p>=65 && p<=90)
            {
                v=1;
            }
            
             if(p>=97 && p<=122)
            {
                st=1;
            }
            
        if(c=='!'||c=='@'||c=='#'||c=='$'||c=='%'||c=='^'||c=='&'||c=='*'||c=='('||c==')'||c=='-'||c=='+' )
        {
            t=1;
        }
        
        }
        
        if(r!=1)
        count++;
        
        if(v!=1)
        count++;
        
        if(st!=1)
        count++;
        
        if(t!=1)
        count++;
        
      //  System.out.println(count);
        
        if(l+count<6)
       {      
        count=count+6-(l+count)  ;
         }
        System.out.println(count);
    }
}