this is the code that im using to solve this but i keep getting an error

. be very grateful if someone can help me the program code is on the bottom.```
#power_rating = int(input("what is the power rating of your device?: "))
#hours = int(input("how many hours used per day?: "))
#Perform monthly energy cost calculation
def calculate_cost(power_rating,hours):
consumption =(power_rating * hours) / 1000 #Formula to calculate monthly electricity consumption
cost = consumption * 0.2156 #Formula to calculate monthly energy cost
print("cost", cost) #Modify to display the calculated energy cost value
return cost #Do not remove this line
#Do not remove the next line
calculate_cost(power_rating,hours)
```