# Strong Password 🔑
def minimum_number(n, password):
    res, p = 0, set(password)
    types = [ set("0123456789"), 
             set("abcdefghijklmnopqrstuvwxyz"), 
             set("ABCDEFGHIJKLMNOPQRSTUVWXYZ"), 
             set("!@#$%^&*()-+")]
    res = sum([ 1 for t in types if p - t == p ])
    return max(res, 6 - n)