1def function_that_says_ni(*args, **kwargs):
 2    valid_names = {"храст", "shrub", "bush"}
 3    total_cost = 0
 4    unique_letters = set()
 5
 6    for arg in args:
 7        if isinstance(arg, dict) and "name" in arg:
 8            name = arg["name"].lower()
 9            if name in valid_names:
10                cost = arg.get("cost", 0)
11                total_cost += cost
12    for key, data in kwargs.items():
13        if isinstance(data, dict) and "name" in data:
14            name = data["name"].lower()
15            if name in valid_names:
16                cost = data.get("cost", 0)
17                total_cost += cost
18                unique_letters.update(ch for ch in key)
19
20    if total_cost > 42:
21        return "Ni!"
22    whole_part = int(total_cost)
23    if whole_part == 0:
24        return "Ni!"
25    if len(unique_letters) % whole_part != 0:
26        return "Ni!"
27    return f"{total_cost:.2f}лв"