Given a string s represents the serialization of a nested list, implement a parser to deserialize it and return the deserialized NestedInteger. Each element is either an integer or a list whose elements may also be integers or other lists.
1. 1 <= s.length <= 5 * 104 2. s consists of digits, square brackets "", negative sign '-', and commas ','. 3. s is the serialization of valid NestedInteger.
Input is managed for you
Output is managed for you
] ] ] 789 [ [ ] 456 [ [ ] 123 [