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

An integer has monotone increasing digits if and only if each pair of adjacent digits x and y satisfy x <= y.
Given an integer n, return the largest number that is less than or equal to n with monotone increasing digits.
 
Please complete the following python code precisely:
```python
class Solution:
    def monotoneIncreasingDigits(self, n: int) -> int:
```