1def put_all_keywords_into_str(named_bushes):
 2    all_symbols = ""
 3    for bush in named_bushes:
 4        all_symbols += bush["key"]
 5    return all_symbols
 6
 7def get_sum_of_elements_at_index(elements, index):
 8    total_sum = 0
 9    for elem in elements:
10        total_sum += elem[index]
11    return total_sum
12
13def function_that_says_ni(*args, **kwargs):
14    valid_shrub_names = {"храст", "shrub", "bush"}
15    named_bushes = []
16    no_name_bushes = []
17    for arg in args: 
18        if isinstance(arg, dict) and "name" in arg and isinstance(arg["name"], str):
19            name = arg.get("name").lower()
20            if name not in valid_shrub_names:
21                continue
22            cost = arg.get("cost", 0)
23            bush = {
24                "name": name,
25                "cost": cost
26                }
27            no_name_bushes.append(bush)
28    for key, value in kwargs.items(): 
29        if isinstance(value, dict) and "name" in value and isinstance(value["name"], str):
30            name = value.get("name").lower()
31            if name not in valid_shrub_names:
32                continue
33            cost = value.get("cost", 0)
34            bush = {
35                "key": key,
36                "name": name,
37                "cost": cost
38                }
39            named_bushes.append(bush)
40
41    costs_sum = get_sum_of_elements_at_index(no_name_bushes, "cost") + get_sum_of_elements_at_index(named_bushes, "cost")
42    if costs_sum < 1 or costs_sum > 42.00:
43        return "Ni!"
44
45    all_symbols = put_all_keywords_into_str(named_bushes)
46    unique_symbols_count = len(set(all_symbols))
47
48    if unique_symbols_count % int(costs_sum) == 0:
49        return f"{round(costs_sum, 2):.2f}лв"
50    else:
51        return "Ni!"