642. Remove All Adjacent Duplicates in a String

0

Easy

Given a string s consisting of lowercase English letters, the task is to remove adjacent duplicate letters from s until no more removals can be made. Print the final string after all duplicate removals have been made. It is guaranteed that the answer is unique.

Input Format

The input consists of a single line containing the string s.

Output Format

Print the final string.

Example

Input

abbaca

Output

ca

Constraints

1 <= |s| <= 10^5 s consists of lowercase English letters.
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