content: import java.io.*;
  import java.math.*;
  import java.security.*;
  import java.text.*;
  import java.util.*;
  import java.util.concurrent.*;
  import java.util.regex.*;
  
  public class Solution {
      static final String Special_Character = "!@#$%^&*()-+";
                             
      // minimumNumber function
      static int minimumNumber(int n, String password) {
          int addNum = 0;
          if (!password.chars().anyMatch(Character::isDigit)) {
              // for digits
              addNum++;
          }
          if (!password.chars().anyMatch(Character::isLowerCase)) {
              // for lowercase letters
              addNum++;
          }
          if (!password.chars().anyMatch(Character::isUpperCase)) {
              // for uppercase letters
              addNum++;
          }
          if (!password.chars().anyMatch(ch -> Special_Character.indexOf((char) ch) >= 0)) {
              // for special characters
              addNum++;
          }
          addNum = Math.max(addNum, 6 - n);
  
          // Returning the minimum number of characters to make the password strong
          return addNum;
  
      }
  
      private static final Scanner scanner = new Scanner(System.in);
  
      // main function
      public static void main(String[] args) throws IOException {
          BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));
  
          int n = scanner.nextInt();
          scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");
  
          String password = scanner.nextLine();
  
          int answer = minimumNumber(n, password);
  
          bufferedWriter.write(String.valueOf(answer));
          bufferedWriter.newLine();
  
          bufferedWriter.close();
  
          scanner.close();
      }
  }
  