1BUSHES = ["храст", "shrub", "bush"]
 2
 3def evaluate_potential_bush(potentical_bush):
 4    if isinstance(potentical_bush, dict):
 5        return potentical_bush.get("name", "empty").lower() in BUSHES
 6    return False
 7               
 8def get_cost_for_bush(bush):
 9    return bush.get('cost', 0)
10
11def function_that_says_ni(*args, **kwargs):  
12    named_bushes = {}
13    nameless_bushes = []
14    for name,potentical_bush in kwargs.items():
15        if evaluate_potential_bush(potentical_bush):
16            named_bushes[name] = potentical_bush
17
18    for potentical_bush in args:
19        if evaluate_potential_bush(potentical_bush):
20            nameless_bushes.append(potentical_bush)     
21
22    fail = "Ni!"
23
24    if len(named_bushes) == 0 and len(nameless_bushes) == 0:
25        return fail
26
27    total_cost = 0
28    unique_letters = set()
29
30    for bush in nameless_bushes:
31        total_cost += get_cost_for_bush(bush)
32
33    for name,bush in named_bushes.items():
34        total_cost += get_cost_for_bush(bush)
35        unique_letters.update(name)
36
37    if total_cost > 42 or total_cost == 0:
38        return fail
39    
40    beauty_coefficient = len(unique_letters)
41        
42    if(beauty_coefficient % int(total_cost) == 0):
43        return "{:.2f}лв".format(total_cost)
44
45    return fail