def minimumNumber(n, password):
    # Return the minimum number of characters to make the password strong
    numbers = "0123456789"
    lower_case = "abcdefghijklmnopqrstuvwxyz"
    upper_case = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    special_characters = "!@#$%^&*()-+"
    
    not_spl = 1
    not_lower = 1
    not_upper = 1
    not_num = 1
    
    for i in range(n):
        if not_num and password[i] in numbers:
            not_num = 0
        elif not_lower and password[i] in lower_case:
            not_lower = 0
        elif not_upper and password[i] in upper_case:
            not_upper = 0
        elif not_spl and password[i] in special_characters:
            not_spl = 0
    
    req_char = not_lower + not_num + not_spl + not_upper
    
    if n<6:
        return max(req_char, 6 - n)
    else:
        return req_char