string to float conversion fails

[PetarPetrenko]

Python version: 3.12
Windows 10, x64

This the problematic raw:

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a = float(input("Vnesi ja osnovata a = "))
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When I press "enter" I get this message:

Traceback (most recent call last):
File "C:\Users\5ar5r\Desktop\keops.py", line 1,
in a = float(input("Vnesi ja osnovata (a) = "))
ValueError: could not convert string to float: ''

I try to get a number value from the input and when I press "enter" I expect that Python will convert empty string into number 0, but it does not. Please, can you explain to me where the problem is?