def minimumNumber(n, password):
    # Return the minimum number of characters to make the password strong
    len_required = 6
    has_digit = False
    has_lower_case = False
    has_upper_case = False
    has_special_char = False 
    special_char = set("!@#$%^&*()-+")
    char_required = 4
    for i in password:
        if "0" <= i <= "9" and not has_digit:
            has_digit = True
            char_required -= 1
        elif "a" <= i <= "z" and not has_lower_case:
            has_lower_case = True
            char_required -= 1
        elif "A" <= i <= "Z" and not has_upper_case:
            has_upper_case = True
            char_required -= 1
        elif i in special_char and not has_special_char:
            has_special_char = True
            char_required -= 1
            
    if n >= len_required:
        return char_required
        
    len_diff = len_required - n
                 
    return len_diff if len_diff > char_required else char_required