Valid Parentheses

Given a string s containing only the characters '(', ')', '{', '}', '[' and ']', return whether s is valid.

An input string is valid if:

1. Open brackets must be closed by the same type of brackets.
2. Open brackets must be closed in the correct order.
3. Every close bracket has a corresponding open bracket of the same type.

Examples

Example 1

Input: s = "()"
Output: true

Example 2

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

Example 3

Input: s = "(]"
Output: false