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

Given a string s, return true if s is a good string, or false otherwise.
A string s is good if all the characters that appear in s have the same number of occurrences (i.e., the same frequency).
 
Please complete the following python code precisely:
```python
class Solution:
    def areOccurrencesEqual(self, s: str) -> bool:
```