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) {
        String numbers = "0123456789";
        String lower_case = "abcdefghijklmnopqrstuvwxyz";
        String upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        String special_characters = "!@#$%^&*()-+";
        // Return the minimum number of characters to make the password strong
        int done=0,count=0;
        for(int i=0;i<password.length();i++){
            int a=password.charAt(i) - 'a';
            if(a>=0&&a<=26){done=1;break;}
        }
        if(done!=1){count++;}
        done=0;
        for(int i=0;i<password.length();i++){
            int a=password.charAt(i) - 'A';
            if(a>=0&&a<=26){done=1;break;}
        }
        if(done!=1){count++;}
        done=0;
        for(int i=0;i<password.length();i++){
            int a=password.charAt(i) - '0';
            if(a>=0&&a<=9){done=1;break;}
        }
        if(done!=1){count++;}
        done=0;
        for(int i=0;i<password.length();i++){
            char a=password.charAt(i);
            if(a=='!'||a=='@'||a=='#'||a=='$'||a=='%'||a=='^'||a=='&'||a=='*'||a=='('||a==')'||a=='-'||a=='+'){done=1;break;}
        }
        if(done!=1){count++;}
        if(count+n<6){count = 6-(password.length());}
        return count;
    }

    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();
    }
}