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

You are given a string s formed by digits and '#'. We want to map s to English lowercase characters as follows:

Characters ('a' to 'i') are represented by ('1' to '9') respectively.
Characters ('j' to 'z') are represented by ('10#' to '26#') respectively.

Return the string formed after mapping.
The test cases are generated so that a unique mapping will always exist.
 
Please complete the following python code precisely:
```python
class Solution:
    def freqAlphabets(self, s: str) -> str:
```