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 ans = 0;
        
        boolean hasDigit = false;
        for(int i = 0; i < n; i++)
        {
            char ch1 = password.charAt(i);
            if(Character.isDigit(ch1))
            {
                hasDigit = true;
            }
        }
        if(hasDigit == false){
            ans = ans + 1;
        }
        
        boolean hasLower = false;
        for(int i = 0; i < n; i++)
        {
            char ch1 = password.charAt(i);
            if(Character.isLowerCase(ch1))
            {
                hasLower = true;
            }
        }
        
        if(hasLower == false){
            ans++;
        }
        
        boolean hasUpper = false;
        for(int i = 0; i < n; i++){
            char ch1 = password.charAt(i);
            if(Character.isUpperCase(ch1))
            {
                hasUpper = true;
            }
        }
        
        if(hasUpper == false){
            ans++;
        }
        
        boolean hasSpeci = false;
        for(int i = 0; i < n; i++){
            char ch1 = password.charAt(i);
            if((ch1=='!') || (ch1 == '@') || (ch1=='#') || (ch1 == '$') || (ch1=='%') || (ch1 == '^') || (ch1=='&') || (ch1 == '(') ||(ch1==')') || (ch1 == '-')|| (ch1=='+')){
                hasSpeci = true;
            }
        }
        
        if(hasSpeci == false){
            ans++;
        }
        if(n < 6){
            int numy = 6-n;
            if(numy > ans)
            {
                ans = ans + (numy - ans);
            }
        }
        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();
    }
}