# Find Valid Parentheses

Given a string containing just the characters `(`, `)`, `{`, `}`, `[` and `]`, determine if the input string is valid.

An input string is valid if:

- Open brackets must be closed by the same type of brackets.
- Open brackets must be closed in the correct order.

Note that an empty string is also considered valid.

Input: "()"
Output: true

Input: ")("
Output: false

Input: "()[]{}"
Output: true

Input: "(]"
Output: false

Input: "([)]"
Output: false

Input: "{[]}"
Output: true

Input: "{[]"
Output: false