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

A parentheses string is valid if and only if:

It is the empty string,
It can be written as AB (A concatenated with B), where A and B are valid strings, or
It can be written as (A), where A is a valid string.

You are given a parentheses string s. In one move, you can insert a parenthesis at any position of the string.

For example, if s = "()))", you can insert an opening parenthesis to be "(()))" or a closing parenthesis to be "())))".

Return the minimum number of moves required to make s valid.
 
Please complete the following python code precisely:
```python
class Solution:
    def minAddToMakeValid(self, s: str) -> int:
```