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I. the content of the topic

Given the string S consisting of lowercase letters, the duplicate deletion operation selects two adjacent and identical letters and deletes them.

Repeat the delete operation on S until the deletion cannot continue.

Returns the final string after all duplicates are deleted. The answer is guaranteed only.

Example:

Enter: "abbaca"

Output: "ca"

Explanation:

For example, in "abbaca", we can delete "bb" because the two letters are adjacent and the same, which is the only duplicate that can be deleted at this time. Then we get the string "aaca", where only "aa" can delete duplicates, so the final string is "ca".

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