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) {
        // Return the minimum number of characters to make the password strong
        boolean valid = true;
                if (password.length() < 6)
                {
                        
                
                
                    String upperCaseChars = "(.*[A-Z].*)";
                    else if (!password.matches(upperCaseChars ))
                    {
                            System.out.println("Password should contain atleast one upper case alphabet");
                            valid = false;
                    }
                    String lowerCaseChars = "(.*[a-z].*)";
                    else if (!password.matches(lowerCaseChars ))
                    {
                            System.out.println("Password should contain atleast one lower case alphabet");
                            valid = false;
                    }
                    String numbers = "(.*[0-9].*)";
                    else if (!password.matches(numbers ))
                    {
                            System.out.println("Password should contain atleast one number.");
                            valid = false;
                    }
                    String specialChars = "(.*[,~,!,@,#,$,%,^,&,*,(,),-,_,=,+,[,{,],},|,;,:,<,>,/,?].*$)";
                    else if (!password.matches(specialChars ))
                    {
                            System.out.println("Password should contain atleast one special character");
                            valid = false;
                    }
                    else
                    {
                        System.out.println("Password has number,specialchar,lowerchar and also upperchar but size is small");
                    }
                }
        else if(password.length()>6)
        {
          if(!password.matches(numbers) && !password.matches(specialChars) && !password.matches(lowerCaseChars) &&        !password.matches(upperCaseChars))  
          {
              System.out.println("Password should contain atleast one number,lowercasechar,uppercasechar or specialchar");
              valid = false;
          }
        else
        {
            System.out.println("Password is strong");
        }
    }

    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();
    }
}