1#checks if the shrub is valid
 2def is_valid(shrub):
 3        if "name" in shrub:
 4            name_val = shrub["name"].lower()
 5            if name_val in ["храст", "shrub", "bush"]:
 6                return True
 7        return False
 8 
 9#checks if the total cost is bigger than 42    
10def total_cost_check(total_cost):
11      return total_cost > 42
12
13#checks if the bush is nice
14def nice(unique_letters_count, total_cost):
15      if unique_letters_count == 0:
16         return False
17      return unique_letters_count % int(total_cost) == 0
18
19#checks if the total cost is zero
20def is_zero(total_cost):
21      return int(total_cost) == 0
22
23
24def function_that_says_ni(*args, **kwargs):
25    # empty list to store valid shrubs
26    shrubs = []
27
28    # empty set to keep track of unique letters
29    unique_letters = set()
30
31    # total cost of shrubs
32    total_cost = 0.0
33
34    # check if it is valid shrub
35    
36
37    for arg in args:
38        if isinstance(arg, dict):
39            if is_valid(arg):
40                shrubs.append(arg)
41                total_cost += arg.get("cost", 0)
42
43    for key, value in kwargs.items():
44        if isinstance(value, dict):
45            if is_valid(value):
46                shrubs.append(value)
47                total_cost += value.get("cost", 0)
48                unique_letters.add(key)
49
50    if total_cost_check(total_cost):
51        return "Ni!"
52
53    unique_letters_count = len(unique_letters)
54
55    if is_zero(total_cost):
56      return "Ni!"
57    
58    if nice(unique_letters_count, total_cost):
59        return "Ni!"
60
61    f_cost = f"{total_cost:.2f}лв"
62    return f_cost