1def function_that_says_ni(*args, **kwargs):
 2    total_cost = 0.0
 3    unique_letters = set()
 4    variable_type = (int, float)
 5    types_of_shrubs = {"храст", "shrub", "bush"}
 6
 7    def check_item(element):
 8        if type(element.get("name")) is not str or element["name"].lower() not in types_of_shrubs:
 9            return False
10        if "cost" in element and (type(element["cost"]) not in variable_type or element["cost"] < 0):
11            return False
12        return True
13
14    def add_cost(element):
15        return round(element.get("cost", 0), 2)
16
17    for arg in args:
18        if type(arg) is dict and check_item(arg):
19            total_cost += add_cost(arg)
20
21    for key, value in kwargs.items():
22        if type(value) is dict and check_item(value):
23            unique_letters.update(letter for letter in key if letter.islower() or letter == '_')
24            total_cost += add_cost(value)
25
26    if total_cost > 42.00:
27        return "Ni!"
28
29    integer_cost = int(total_cost)
30    if integer_cost == 0 or len(unique_letters) % integer_cost != 0:
31        return "Ni!"
32
33    return f"{total_cost:.2f}лв"