Given a string, complete the given function to recursively remove the adjacent duplicate characters and return the resultant string. If there are no characters left in the resultant string, return “-1” (without quotes).
Sample Test Cases
Sample Input: ABCCBCBA
Output: ACBA
Explanation: (ABCCBCBA –> ABBCBA –> ACBA)
Sample Input: AA
Sample Output: -1
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