Please solve the programming task below using a self-contained code snippet in a markdown code block.

You are given a string s of even length. Split this string into two halves of equal lengths, and let a be the first half and b be the second half.
Two strings are alike if they have the same number of vowels ('a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U'). Notice that s contains uppercase and lowercase letters.
Return true if a and b are alike. Otherwise, return false.
 
Please complete the following python code precisely:
```python
class Solution:
    def halvesAreAlike(self, s: str) -> bool:
```