1def is_a_bush(potential_bush, total_cost):
 2    valid_names = ("храст", "bush", "shrub")
 3    
 4    name = potential_bush.get('name', '').lower()
 5
 6    # Checking if the name is valid
 7    for curr_name in valid_names:
 8        if curr_name.lower() == name:
 9            cost = potential_bush.get('cost', 0)
10
11            # Checking if the cost is valid - int or float
12            if isinstance(cost, (int, float)):
13                total_cost += cost
14                
15            return True, total_cost
16                
17    return False, total_cost
18                    
19def function_that_says_ni(*args, **kwargs):
20    total_cost = 0
21    unique_letters = set()
22
23    # Looping through all args and searching for a bush
24    for arg in args:
25        if isinstance(arg, dict):
26            _, total_cost = is_a_bush(arg, total_cost)
27
28    # Looping through all kwargs and searching for a bush
29    for var_name, kwarg in kwargs.items():
30        if isinstance(kwarg, dict):
31            is_bush, total_cost = is_a_bush(kwarg, total_cost)
32            if is_bush:
33                unique_letters.update(set(var_name))
34    
35    unique_symbols_count = len(unique_letters)
36
37    if (int(total_cost) != 0 and total_cost <= 42 and unique_symbols_count >= 0 
38       and unique_symbols_count % int(total_cost) == 0):
39        return f"{total_cost:.2f}лв"
40    else:
41        return "Ni!"