def minimumNumber(n, password):
    # Return the minimum number of characters to make the password strong
    special_characters = "!@#$%^&*()-+"

    d = lower = upper = sc = 0
    for ch in password:
        if ch.isdigit() and d == 0:
            d = 1
        elif ch.islower() and lower == 0:
            lower = 1
        elif ch.isupper() and upper == 0:
            upper = 1
        elif ch in special_characters and sc == 0:
            sc = 1

    total = d + lower + upper + sc

    return max(6-n, 4-total)